A) 7C₂ =(Simplify your answer.)

asked Jun 19, 2023 177k views

3 votes

by Srpr

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This is a combination of the form:

$\begin{gathered} C(n,k)=nCk=(n!)/(k!(n-k)!) \\ where: \\ n>k \end{gathered}$

So:

$7C_2=(7!)/(2!(7-2)!)=(7!)/(2!\cdot5!)=(5040)/(2\cdot120)=(5040)/(240)=21$

Answer:

FreddieE answered Jun 26, 2023

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