2 years ago

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?

1 answer:

6 0

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

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