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Which of the following choices is equivalent to ${}_{9}C_{4}$?

Select ALL that apply.

${}_{9}C_{4} = \frac{9!}{4!}$

${}_{9}C_{4}= 126$

${}_{9}C_{4} =\frac{3024}{24}$

${}_{9}C_{4} = \frac{15,120}{4\cdot3\cdot2\cdot1}$