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January 28, 2015

January 28, 2015

Posted by **Alejandro** on Sunday, November 28, 2010 at 9:52pm.

- Math -
**MathMate**, Monday, November 29, 2010 at 10:05amSplit the coins into three groups, A, B and C consisting of 3 coins in each group.

Weigh: A--B

1. If A=B, the the counterfeit is in group C

Weigh any two coins in group C and figure out the rest.

2. If A≠B, then the counterfeit is in the lighter group.

Weigh any two coins in the lighter group and figure out the rest.

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