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Out of 8 balls, one weighs less than the others. You have a
scale. What is the minimum number of weighs to determine the
ball that weighs less?
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Answer Posted / thomas kotzyba
1. Determine the set of three with the ball that weights less: Pick 6 balls - weight 3 against 3 - if equal the searched for is within the remaining 3 balls.
2. You are left with a set of three balls, one of which weights less. Pick 2 balls - weight them against each other - if equal the searched for is the one you did not pick.
Ans=2
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