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Microsoft Program Manager Interview Question (student candidate)

"How would you determine the heaviest marble among 9 marbles where 8 weigh the same and you can use the scale only twice?"
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1st weighing
pick any 6 marbles and weigh 3 vs 3 . If both are same , heaviest is in the remaining 3. Else heaviest is one of these 3. So after the first weighing we are left with 3 marbles.
2nd weighing
take any 2 and compare them. If they both weigh same then the remaining one is the heaviest. Else you know it.
- rkt on Apr 26, 2012 Flag Response

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