Interview Question

Interview Boston, MA

"There are 8 balls, one of which is slightly lighter than

  the others. You have a balance, how do you find the lighter ball?"

Interview Answer

1 Answer


The answer is to weigh three balls on each side first. If they balance then you weigh the two you didn't initially weigh. If they don't balance they you weigh two from the side that was lighter. You can get to the answer weighing only twice.

Interview Candidate on Sep 25, 2013

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