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)

Answer» <html><body><p><br/></p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :`=""^(<a href="https://interviewquestions.tuteehub.com/tag/n-568463" style="font-weight:bold;" target="_blank" title="Click to know more about N">N</a>)C_(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>).""^(n-2)C_(r-4).2^(r-4)`</body></html>


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