Audio Analytic Interview Question: You have 7 balls and one is s... |

Interview Question

Software Engineer Interview Cambridge, England

You have 7 balls and one is slightly heavier that the

  others, you have a penny balance, what's the minimum number of pennies you have to spend to find out which ball is heavier.

Interview Answer

1 Answer


2 pennies. Measure 3 and 3, if those are equal it's the other ball, if it tilts, discard the rest and measure two random of those 3 and with that you get which one it is.

Interview Candidate on 27 Feb 2015

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