Wednesday, March 17, 2010

Version 2 case 1

Version 2 (Case 1)

Rationale

First weighing

Put any 3 coins on either side of the scale.

If the scale balances, the counterfeit is in the 3 remaining coins.

Second weighing

Place 2 of the remaining coins, each on either side of the scale.

1) If the scale balances, the counterfeit is the last coin

2)If the scale is unbalanced, the heavier side contains the counterfeit coin

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