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Interview Question

Interview Houston, TX

There are 9 balls, one is lighter than the others. In three

  moves determine which is the lighter one.
brain teaser

Interview Answer

1 Answer


Divide into 3 sets of 3. Compare two sets. If equal, then lighter ball is in 3rd set. If one set is lighter, then ball is in the lighter set. Take two balls from the lighter set, if equal, 3rd ball is light ball. If not equal, then lighter ball is in hand.

Interview Candidate on Jul 12, 2012

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