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Combinatorics

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Subsets of k People

COMBIN-K4LUU4

Indicate ALL expressions that are equal to the number of ways to select a subset of $k$ people from a set of $n$ people.

Select ALL that apply.

A

$n!/k!$

B

${k\choose n}$

C

${n\choose n-k}$

D

$n^k$

E

${n\choose k}$

F

$k^n$