You have nine marbles, one of which weighs slightly more than the other eight. However, the heavier marble looks the same as the other marbles, and the difference in weight is neglibible enough that you can't ell which is the heavier marble simply by holding it in your hand.
Fortunatley, you have a weighing scale, which consists of two pans balanced against one another. What's the smallest number of weighings you would need to do to determine which is the heavy marble?
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