Brain Teasers
Operators and Symbols
Add the appropriate mathematical operators or symbols to make the following correct:
3 4 5 = 90
Parentheses may be used freely.
3 4 5 = 90
Parentheses may be used freely.
Hint
The answer is not 3^4 + 4 + 5, as this introduces an extra 4.Answer
(3/4)x5! = 905! is 1x2x3x4x5 = 120
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Comments
Here's another answer.
3x√(√4)x√5 = √90
3x√(√4)x√5 = √90
Still another possibility:
-3!-4!+5!=90
-3!-4!+5!=90
Also (3^2) + (4+5)^2
But that introduces extra "2"s that are not allowed!
another answer is
3 squared times the sqaure root of 4 times 5
3 squared times the sqaure root of 4 times 5
if indice's are vaild then (-3+4)*5^0=cos90 and so on.. but this makes the answers unlimited... co many ways lol
Neat, thank you, I was going this way
cos(3 x 4! * 5) = 9 ^ 0
sin(3 x 4! * 5) = 9 * 0.
cos(3 x 4! * 5) = 9 ^ 0
sin(3 x 4! * 5) = 9 * 0.
wow. nerds.
I had nettlett's answer: -3! - 4! + 5! = 90
3+sqrt(4)-5=9*0
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