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Last Balls

The answer to the last balls question is tipped by the follow up question.  Because you ask a followup question that changes nothing but the number of red balls, it's easy to infer that the # of red balls is the significant thing.  The structure of the problem already suggests an odd-even angle to the problem, and you completely give it away by asking a followup with only one key change:  the oddness of the # of red balls.

Thursday, July 25, 2002

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