2019 is coming!
$begingroup$
Use $2$ $0$ $1 $ and $9$ to make the numbers $66, 74, 76, and$ $77$
RULES
You must use all 4 digits.
Only the digits 2, 0, 1, and 9 can be used.
You can make multi-digit numbers out of the numbers. Examples: 20, 92, 2.9The square function may NOT be used. Nor may the cube, raise to a fourth power, or any other function that raises a number to a specific power.
You may use the ^ operation if you use a digit, for example, [(9 + 1)^2 - 0!] is acceptable (if you're trying to get 99), because 2, 0, 1, and 9 is used.
However, [20 ^ 2 / 9 + 1] can't be used to get 40 because it uses an extra 2.Sorry, but the integer function may NOT be used. Nor may the round, floor, ceiling, more than 2 factorials in a row, repeating symbol, or truncate functions.
+, -, *, /, (), !, sqrt, ^, and !! may be used for functions.
I picked these because these are the hardest for 2019. From the numbers 1-100, these are the only ones I didn't get.
Again, no brute-force methods. Good luck.
mathematics
$endgroup$
|
show 3 more comments
$begingroup$
Use $2$ $0$ $1 $ and $9$ to make the numbers $66, 74, 76, and$ $77$
RULES
You must use all 4 digits.
Only the digits 2, 0, 1, and 9 can be used.
You can make multi-digit numbers out of the numbers. Examples: 20, 92, 2.9The square function may NOT be used. Nor may the cube, raise to a fourth power, or any other function that raises a number to a specific power.
You may use the ^ operation if you use a digit, for example, [(9 + 1)^2 - 0!] is acceptable (if you're trying to get 99), because 2, 0, 1, and 9 is used.
However, [20 ^ 2 / 9 + 1] can't be used to get 40 because it uses an extra 2.Sorry, but the integer function may NOT be used. Nor may the round, floor, ceiling, more than 2 factorials in a row, repeating symbol, or truncate functions.
+, -, *, /, (), !, sqrt, ^, and !! may be used for functions.
I picked these because these are the hardest for 2019. From the numbers 1-100, these are the only ones I didn't get.
Again, no brute-force methods. Good luck.
mathematics
$endgroup$
$begingroup$
Are these solutions possible?
$endgroup$
– QuantumTwinkie
Sep 12 '18 at 21:26
1
$begingroup$
@QuantumTwinkie let's find out! :D
$endgroup$
– user477343
Sep 12 '18 at 21:47
1
$begingroup$
@Alto Doesn't using sqrt contradict your requirements? It's an explicit square root, i.e. it uses 2, or, even worse, it could be represented as x^1/2 which uses 1 and 2.
$endgroup$
– rhsquared
Sep 13 '18 at 2:36
1
$begingroup$
@user477343 You are quite right. Maybe I won't be allowed to answer because of the implicit two in my name.
$endgroup$
– rhsquared
Sep 13 '18 at 6:01
1
$begingroup$
Are bare decimal points allowed, like $.1$ and $.2$?
$endgroup$
– nickgard
Sep 13 '18 at 8:01
|
show 3 more comments
$begingroup$
Use $2$ $0$ $1 $ and $9$ to make the numbers $66, 74, 76, and$ $77$
RULES
You must use all 4 digits.
Only the digits 2, 0, 1, and 9 can be used.
You can make multi-digit numbers out of the numbers. Examples: 20, 92, 2.9The square function may NOT be used. Nor may the cube, raise to a fourth power, or any other function that raises a number to a specific power.
You may use the ^ operation if you use a digit, for example, [(9 + 1)^2 - 0!] is acceptable (if you're trying to get 99), because 2, 0, 1, and 9 is used.
However, [20 ^ 2 / 9 + 1] can't be used to get 40 because it uses an extra 2.Sorry, but the integer function may NOT be used. Nor may the round, floor, ceiling, more than 2 factorials in a row, repeating symbol, or truncate functions.
+, -, *, /, (), !, sqrt, ^, and !! may be used for functions.
I picked these because these are the hardest for 2019. From the numbers 1-100, these are the only ones I didn't get.
Again, no brute-force methods. Good luck.
mathematics
$endgroup$
Use $2$ $0$ $1 $ and $9$ to make the numbers $66, 74, 76, and$ $77$
RULES
You must use all 4 digits.
Only the digits 2, 0, 1, and 9 can be used.
You can make multi-digit numbers out of the numbers. Examples: 20, 92, 2.9The square function may NOT be used. Nor may the cube, raise to a fourth power, or any other function that raises a number to a specific power.
You may use the ^ operation if you use a digit, for example, [(9 + 1)^2 - 0!] is acceptable (if you're trying to get 99), because 2, 0, 1, and 9 is used.
However, [20 ^ 2 / 9 + 1] can't be used to get 40 because it uses an extra 2.Sorry, but the integer function may NOT be used. Nor may the round, floor, ceiling, more than 2 factorials in a row, repeating symbol, or truncate functions.
+, -, *, /, (), !, sqrt, ^, and !! may be used for functions.
I picked these because these are the hardest for 2019. From the numbers 1-100, these are the only ones I didn't get.
Again, no brute-force methods. Good luck.
mathematics
mathematics
asked Sep 12 '18 at 20:30
AltoAlto
1,094119
1,094119
$begingroup$
Are these solutions possible?
$endgroup$
– QuantumTwinkie
Sep 12 '18 at 21:26
1
$begingroup$
@QuantumTwinkie let's find out! :D
$endgroup$
– user477343
Sep 12 '18 at 21:47
1
$begingroup$
@Alto Doesn't using sqrt contradict your requirements? It's an explicit square root, i.e. it uses 2, or, even worse, it could be represented as x^1/2 which uses 1 and 2.
$endgroup$
– rhsquared
Sep 13 '18 at 2:36
1
$begingroup$
@user477343 You are quite right. Maybe I won't be allowed to answer because of the implicit two in my name.
$endgroup$
– rhsquared
Sep 13 '18 at 6:01
1
$begingroup$
Are bare decimal points allowed, like $.1$ and $.2$?
$endgroup$
– nickgard
Sep 13 '18 at 8:01
|
show 3 more comments
$begingroup$
Are these solutions possible?
$endgroup$
– QuantumTwinkie
Sep 12 '18 at 21:26
1
$begingroup$
@QuantumTwinkie let's find out! :D
$endgroup$
– user477343
Sep 12 '18 at 21:47
1
$begingroup$
@Alto Doesn't using sqrt contradict your requirements? It's an explicit square root, i.e. it uses 2, or, even worse, it could be represented as x^1/2 which uses 1 and 2.
$endgroup$
– rhsquared
Sep 13 '18 at 2:36
1
$begingroup$
@user477343 You are quite right. Maybe I won't be allowed to answer because of the implicit two in my name.
$endgroup$
– rhsquared
Sep 13 '18 at 6:01
1
$begingroup$
Are bare decimal points allowed, like $.1$ and $.2$?
$endgroup$
– nickgard
Sep 13 '18 at 8:01
$begingroup$
Are these solutions possible?
$endgroup$
– QuantumTwinkie
Sep 12 '18 at 21:26
$begingroup$
Are these solutions possible?
$endgroup$
– QuantumTwinkie
Sep 12 '18 at 21:26
1
1
$begingroup$
@QuantumTwinkie let's find out! :D
$endgroup$
– user477343
Sep 12 '18 at 21:47
$begingroup$
@QuantumTwinkie let's find out! :D
$endgroup$
– user477343
Sep 12 '18 at 21:47
1
1
$begingroup$
@Alto Doesn't using sqrt contradict your requirements? It's an explicit square root, i.e. it uses 2, or, even worse, it could be represented as x^1/2 which uses 1 and 2.
$endgroup$
– rhsquared
Sep 13 '18 at 2:36
$begingroup$
@Alto Doesn't using sqrt contradict your requirements? It's an explicit square root, i.e. it uses 2, or, even worse, it could be represented as x^1/2 which uses 1 and 2.
$endgroup$
– rhsquared
Sep 13 '18 at 2:36
1
1
$begingroup$
@user477343 You are quite right. Maybe I won't be allowed to answer because of the implicit two in my name.
$endgroup$
– rhsquared
Sep 13 '18 at 6:01
$begingroup$
@user477343 You are quite right. Maybe I won't be allowed to answer because of the implicit two in my name.
$endgroup$
– rhsquared
Sep 13 '18 at 6:01
1
1
$begingroup$
Are bare decimal points allowed, like $.1$ and $.2$?
$endgroup$
– nickgard
Sep 13 '18 at 8:01
$begingroup$
Are bare decimal points allowed, like $.1$ and $.2$?
$endgroup$
– nickgard
Sep 13 '18 at 8:01
|
show 3 more comments
3 Answers
3
active
oldest
votes
$begingroup$
66:
$(sqrt{9})!times(12-0!)$
74:
$9/.12-0!$
76:
$9/.12+0!$
77:
$((sqrt{9})!)!times.1+(0!/.2)$
$endgroup$
$begingroup$
I think the square function cannot be used
$endgroup$
– Ian Fako
Sep 13 '18 at 9:18
$begingroup$
No it can't even I tried using it.
$endgroup$
– Quark-epoch
Sep 13 '18 at 9:38
$begingroup$
And you can't concatenate to make $12$, either, but $(+1)$ in at least $13$ hours for the effort (DVL) :D
$endgroup$
– user477343
Sep 13 '18 at 10:44
$begingroup$
@user477343 you can concatenate 1 and 2. See examples above20, 92, 2.9
$endgroup$
– Ian Fako
Sep 13 '18 at 10:52
$begingroup$
@IanFako Wait... I thought it said "can't" .... dammit, I would have had more of a chance finding a solution otherwise. Eh well, everything happens for a reason... at least in my philosophy.
$endgroup$
– user477343
Sep 13 '18 at 10:54
add a comment |
$begingroup$
Also here is another solution to 77 that might be easier- (√9!)!*.1+(0!/.2)
The equation doesn't require the use of a double factorial.
KG
$endgroup$
$begingroup$
You should check the other answers before adding a new one. This is the same as the accepted answer for 77.
$endgroup$
– Herb Wolfe
Jan 7 at 21:52
add a comment |
$begingroup$
How do you get 83 and 86 using these numbers?
New contributor
$endgroup$
add a comment |
Your Answer
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
66:
$(sqrt{9})!times(12-0!)$
74:
$9/.12-0!$
76:
$9/.12+0!$
77:
$((sqrt{9})!)!times.1+(0!/.2)$
$endgroup$
$begingroup$
I think the square function cannot be used
$endgroup$
– Ian Fako
Sep 13 '18 at 9:18
$begingroup$
No it can't even I tried using it.
$endgroup$
– Quark-epoch
Sep 13 '18 at 9:38
$begingroup$
And you can't concatenate to make $12$, either, but $(+1)$ in at least $13$ hours for the effort (DVL) :D
$endgroup$
– user477343
Sep 13 '18 at 10:44
$begingroup$
@user477343 you can concatenate 1 and 2. See examples above20, 92, 2.9
$endgroup$
– Ian Fako
Sep 13 '18 at 10:52
$begingroup$
@IanFako Wait... I thought it said "can't" .... dammit, I would have had more of a chance finding a solution otherwise. Eh well, everything happens for a reason... at least in my philosophy.
$endgroup$
– user477343
Sep 13 '18 at 10:54
add a comment |
$begingroup$
66:
$(sqrt{9})!times(12-0!)$
74:
$9/.12-0!$
76:
$9/.12+0!$
77:
$((sqrt{9})!)!times.1+(0!/.2)$
$endgroup$
$begingroup$
I think the square function cannot be used
$endgroup$
– Ian Fako
Sep 13 '18 at 9:18
$begingroup$
No it can't even I tried using it.
$endgroup$
– Quark-epoch
Sep 13 '18 at 9:38
$begingroup$
And you can't concatenate to make $12$, either, but $(+1)$ in at least $13$ hours for the effort (DVL) :D
$endgroup$
– user477343
Sep 13 '18 at 10:44
$begingroup$
@user477343 you can concatenate 1 and 2. See examples above20, 92, 2.9
$endgroup$
– Ian Fako
Sep 13 '18 at 10:52
$begingroup$
@IanFako Wait... I thought it said "can't" .... dammit, I would have had more of a chance finding a solution otherwise. Eh well, everything happens for a reason... at least in my philosophy.
$endgroup$
– user477343
Sep 13 '18 at 10:54
add a comment |
$begingroup$
66:
$(sqrt{9})!times(12-0!)$
74:
$9/.12-0!$
76:
$9/.12+0!$
77:
$((sqrt{9})!)!times.1+(0!/.2)$
$endgroup$
66:
$(sqrt{9})!times(12-0!)$
74:
$9/.12-0!$
76:
$9/.12+0!$
77:
$((sqrt{9})!)!times.1+(0!/.2)$
answered Sep 13 '18 at 8:35
nickgardnickgard
1,7601815
1,7601815
$begingroup$
I think the square function cannot be used
$endgroup$
– Ian Fako
Sep 13 '18 at 9:18
$begingroup$
No it can't even I tried using it.
$endgroup$
– Quark-epoch
Sep 13 '18 at 9:38
$begingroup$
And you can't concatenate to make $12$, either, but $(+1)$ in at least $13$ hours for the effort (DVL) :D
$endgroup$
– user477343
Sep 13 '18 at 10:44
$begingroup$
@user477343 you can concatenate 1 and 2. See examples above20, 92, 2.9
$endgroup$
– Ian Fako
Sep 13 '18 at 10:52
$begingroup$
@IanFako Wait... I thought it said "can't" .... dammit, I would have had more of a chance finding a solution otherwise. Eh well, everything happens for a reason... at least in my philosophy.
$endgroup$
– user477343
Sep 13 '18 at 10:54
add a comment |
$begingroup$
I think the square function cannot be used
$endgroup$
– Ian Fako
Sep 13 '18 at 9:18
$begingroup$
No it can't even I tried using it.
$endgroup$
– Quark-epoch
Sep 13 '18 at 9:38
$begingroup$
And you can't concatenate to make $12$, either, but $(+1)$ in at least $13$ hours for the effort (DVL) :D
$endgroup$
– user477343
Sep 13 '18 at 10:44
$begingroup$
@user477343 you can concatenate 1 and 2. See examples above20, 92, 2.9
$endgroup$
– Ian Fako
Sep 13 '18 at 10:52
$begingroup$
@IanFako Wait... I thought it said "can't" .... dammit, I would have had more of a chance finding a solution otherwise. Eh well, everything happens for a reason... at least in my philosophy.
$endgroup$
– user477343
Sep 13 '18 at 10:54
$begingroup$
I think the square function cannot be used
$endgroup$
– Ian Fako
Sep 13 '18 at 9:18
$begingroup$
I think the square function cannot be used
$endgroup$
– Ian Fako
Sep 13 '18 at 9:18
$begingroup$
No it can't even I tried using it.
$endgroup$
– Quark-epoch
Sep 13 '18 at 9:38
$begingroup$
No it can't even I tried using it.
$endgroup$
– Quark-epoch
Sep 13 '18 at 9:38
$begingroup$
And you can't concatenate to make $12$, either, but $(+1)$ in at least $13$ hours for the effort (DVL) :D
$endgroup$
– user477343
Sep 13 '18 at 10:44
$begingroup$
And you can't concatenate to make $12$, either, but $(+1)$ in at least $13$ hours for the effort (DVL) :D
$endgroup$
– user477343
Sep 13 '18 at 10:44
$begingroup$
@user477343 you can concatenate 1 and 2. See examples above
20, 92, 2.9
$endgroup$
– Ian Fako
Sep 13 '18 at 10:52
$begingroup$
@user477343 you can concatenate 1 and 2. See examples above
20, 92, 2.9
$endgroup$
– Ian Fako
Sep 13 '18 at 10:52
$begingroup$
@IanFako Wait... I thought it said "can't" .... dammit, I would have had more of a chance finding a solution otherwise. Eh well, everything happens for a reason... at least in my philosophy.
$endgroup$
– user477343
Sep 13 '18 at 10:54
$begingroup$
@IanFako Wait... I thought it said "can't" .... dammit, I would have had more of a chance finding a solution otherwise. Eh well, everything happens for a reason... at least in my philosophy.
$endgroup$
– user477343
Sep 13 '18 at 10:54
add a comment |
$begingroup$
Also here is another solution to 77 that might be easier- (√9!)!*.1+(0!/.2)
The equation doesn't require the use of a double factorial.
KG
$endgroup$
$begingroup$
You should check the other answers before adding a new one. This is the same as the accepted answer for 77.
$endgroup$
– Herb Wolfe
Jan 7 at 21:52
add a comment |
$begingroup$
Also here is another solution to 77 that might be easier- (√9!)!*.1+(0!/.2)
The equation doesn't require the use of a double factorial.
KG
$endgroup$
$begingroup$
You should check the other answers before adding a new one. This is the same as the accepted answer for 77.
$endgroup$
– Herb Wolfe
Jan 7 at 21:52
add a comment |
$begingroup$
Also here is another solution to 77 that might be easier- (√9!)!*.1+(0!/.2)
The equation doesn't require the use of a double factorial.
KG
$endgroup$
Also here is another solution to 77 that might be easier- (√9!)!*.1+(0!/.2)
The equation doesn't require the use of a double factorial.
KG
answered Jan 7 at 21:36
MathMaster920MathMaster920
12
12
$begingroup$
You should check the other answers before adding a new one. This is the same as the accepted answer for 77.
$endgroup$
– Herb Wolfe
Jan 7 at 21:52
add a comment |
$begingroup$
You should check the other answers before adding a new one. This is the same as the accepted answer for 77.
$endgroup$
– Herb Wolfe
Jan 7 at 21:52
$begingroup$
You should check the other answers before adding a new one. This is the same as the accepted answer for 77.
$endgroup$
– Herb Wolfe
Jan 7 at 21:52
$begingroup$
You should check the other answers before adding a new one. This is the same as the accepted answer for 77.
$endgroup$
– Herb Wolfe
Jan 7 at 21:52
add a comment |
$begingroup$
How do you get 83 and 86 using these numbers?
New contributor
$endgroup$
add a comment |
$begingroup$
How do you get 83 and 86 using these numbers?
New contributor
$endgroup$
add a comment |
$begingroup$
How do you get 83 and 86 using these numbers?
New contributor
$endgroup$
How do you get 83 and 86 using these numbers?
New contributor
New contributor
answered 2 mins ago
AllenAllen
1
1
New contributor
New contributor
add a comment |
add a comment |
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$begingroup$
Are these solutions possible?
$endgroup$
– QuantumTwinkie
Sep 12 '18 at 21:26
1
$begingroup$
@QuantumTwinkie let's find out! :D
$endgroup$
– user477343
Sep 12 '18 at 21:47
1
$begingroup$
@Alto Doesn't using sqrt contradict your requirements? It's an explicit square root, i.e. it uses 2, or, even worse, it could be represented as x^1/2 which uses 1 and 2.
$endgroup$
– rhsquared
Sep 13 '18 at 2:36
1
$begingroup$
@user477343 You are quite right. Maybe I won't be allowed to answer because of the implicit two in my name.
$endgroup$
– rhsquared
Sep 13 '18 at 6:01
1
$begingroup$
Are bare decimal points allowed, like $.1$ and $.2$?
$endgroup$
– nickgard
Sep 13 '18 at 8:01