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Interview Question for Software Engineering Manager at NetApp:

Mar 19, 2009

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A IQ question: I have 9 coins and 8 have the same weight and the last one is heavier. I also have a balance beam to weigh the coins with. I can only use the balance beam 2 times to find the heavier coin. How do you find the heavier coin?

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8 of 8 people found this helpful

Mar 19, 2009

by Interview Candidate:

Divide the coins into 3 piles of 3. Weigh the first 2 piles. If they balance then the heavier coin is in the 3rd pile otherwise its on the balance beam. Take the heavier pile and place 1 coin on each end of the beam. If they are equal then the heavier coin is the 3rd coin else it is on the beam.

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Interview Question for Software Engineering Manager at NetApp:

A IQ question: I have 9 coins and 8 have the same weight and the last one is heavier. I also have a balance beam to weigh the coins with. I can only use the balance beam 2 times to find the heavier coin. How do you find the heavier coin?

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