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Re: A man needs to move up 153 staircase steps to reach the top [#permalink]
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I chose 7 because it is not a multiple of 3. As such, if it is multiplied by 2, and subtracted from 153 we have the following:

153 - 7*2 = 153- 14 = 139

139 is not divisible by 3 and hence he could not have taken 2 steps 7 times and taken 3 steps at once a whole number of times.

Am I correct?

Please let me know.
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Re: A man needs to move up 153 staircase steps to reach the top [#permalink]
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You are correct but technically that problem should work this way

https://quanticdev.com/algorithms/dynam ... -problems/
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Re: A man needs to move up 153 staircase steps to reach the top [#permalink]
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