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Question 15: At a particular school dance there were twenty-five students. Could it be that 10 of the students danced in exactly four waltzes,

Question 15: At a particular school dance there were twenty-five students. Could it be that 10 of the students danced in exactly four waltzes, 11 danced in exactly five waltzes, and 4 danced in exactly six waltzes?

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