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How many ways can we send 10 distinguishable letters to 5 people such that each person gets exactly 2 letters.

Any help would be appreciated

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    Umm, by tearing one of the letters in half? Did you really mean to make the edit that you made earlier?2012-02-28
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    @David: I rolled back user324324's inappropriate edit.2012-06-17

2 Answers 2