There are 25 legislators, of which n people form a group. Each of these n people sends a report to the rest of the non-team members. These non-team members will write a letter to reply to each report. How many reports and letters are there?
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A2n
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B2(25-n)
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C2n(25-n)
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D50
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En(25-n)
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正确答案: C