# Fish tank

A fish tank at a pet store has 8 zebra fish. In how many different ways can George choose 2 zebra fish to buy?

Correct result:

n =  28

#### Solution:

$x={C}_{2}\left(8\right)=\left(\genfrac{}{}{0px}{}{8}{2}\right)=\frac{8!}{2!\left(8-2\right)!}=\frac{8\cdot 7}{2\cdot 1}=28$

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