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Expedia Software Development Engineer II Interview Question

I interviewed in Bellevue, WA and was asked:
"Given a balance and marbles where one marble weighs more than the other, how many times do you have to use the balance to find the heaviest marble for 7 marbles. Then, extend that answer to how many marbles can you weigh with 4 tries."
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Q: how many times do you have to use the balance to find the heaviest marble for 7 marbles
Answer : Twice
Explanation:
1 . Put three marbles at the each side of balance leaving one.
           If both of the sides of balance are equal , then the one left is the heaviest.
           if not take the three marbles which weight more.
2. Among out of 3 from above collection , put one at each side of balance and leave the third one.
           If both side of balance is same then the marble left is heaviest.
           Or the marble which weigh more in the balance is the heaviest.
- Puzzle Lover on Jan 27, 2013 Flag Response

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