#### Answer

$45$

#### Work Step by Step

$\binom {10} 2 =\dfrac {10!}{2!\left( 10-2\right) !}=\dfrac {8!\times 9\times 10}{2!\times 8!}=\dfrac {9\times 10}{1\times 2}=45$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$45$

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