Answer
$C(7,4)=35$
Work Step by Step
Using the combination formula, we obtain:
$C(n,r)=\frac{n!}{(n-r)!r!}$
$C(7,4)=\frac{7!}{(7-4)!4!}=\frac{7!}{3!4!}=\frac{7\cdot6\cdot5\cdot4!}{4!\cdot3\cdot2\cdot1}=35$
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