You have 9 balls, one of which is slightly heavier. Using a balance scale only twice, how do you find the heavier ball?
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Among 9 identical-looking balls, one is slightly heavier. Using a balance scale only twice, how can you always identify the heavier ball?
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Among 9 identical-looking balls, one is slightly heavier. Using a balance scale only twice, how can you always identify the heavier ball?
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Split the balls into three groups of three, weigh two groups against each other to find which group has the heavier ball (or confirm it is the third group), then weigh two of the three balls in that group to isolate the heavier one.
