1.

There are n pairs of shoes in a closet. If r(ltn) are selected at random then the number of ways that among the selected shoes there is exactly one pair is ""^(n)C_(1).""^(n-1)C_(r-2).2^(r-2)

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ANSWER :`=""^(N)C_(1).""^(n-1)C_(r-2).2^(r-2)`


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