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 are exactly 2 pairs is ""^(n)C_(2).""^(n-2)C_(r-4).2^(r-4)

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ANSWER :`=""^(N)C_(2).""^(n-2)C_(r-4).2^(r-4)`


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