#### Answer

$15504$

#### Work Step by Step

We know that if we want to select $r$ objects out of $n$ disregarding the order, we can do this in $_nC_r=\frac{n!}{r!(n-r)!}$ ways.
Here we have $n_1=20,r_1=5$: $_{20}C_5=\frac{20!}{5!15!}=15504$

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Published by
McDougal Littell

ISBN 10:
0618595414

ISBN 13:
978-0-61859-541-9

$15504$

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