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A sportswriter makes his pre-season picks for the top ten teams finish. If there are forty teams, how many different lists could there be?

A sportswriter makes his pre-season picks for the top ten teams finish. If there are forty teams, how many different lists could there be?
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A sportswriter makes his pre-season picks for the top ten teams finish. If there are forty teams, how many different lists could there be?

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User Dcmorse
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\bf _nC_r=\cfrac{n!}{r!(n-r)!}\qquad \begin{cases} n=40\\ r=10 \end{cases}\implies _(40)C_(10)=\cfrac{40!}{10!(40-10)!}
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User Sathishvj
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