#### Answer

4

#### Work Step by Step

$2C2 + 2C1 +2C0$
$2!/(2-2)!2! + 2!/(2-1)!1! +2!/(2-0)!0!$
$2/0!*2 + 2/1!*1! + 2/2!*0!$
$2/1*2 + 2/1*1 + 2/2*1$
$2/2 + 2/1 + 2/2$
$1+2+1 = 4$

Published by
Prentice Hall

ISBN 10:
0133500403

ISBN 13:
978-0-13350-040-0

4

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