How can you identify one ball of a different weight from 12 balls using a balance scale three times?
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Concise Answer: Divide and balance.
Detailed Explanation: Divide the balls into three groups of four. Use the scale to compare two groups. If they balance, the different ball is in the third group. If not, it’s in the heavier group. Then, from the identified group, place two balls on each side of the scale. If they balance, the remaining ball is the different one. If not, you’ve identified the heavier ball. You can determine which ball is different in the third weighing.