Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Chapter 11 - Probability and Statistics - 11-1 Permutations and Combinations - Practice and Problem-Solving Exercises - Page 678: 36

Answer

$35$

Work Step by Step

Solve each separately: $_6C_2=\dfrac{6!}{2!(6-2)!}$ $_6C_2=\dfrac{6!}{2!(4!)}$ $_6C_2=\dfrac{6 {\times} 5 {\times}4 {\times}3{\times}2{\times}1}{(2{\times}1)(4{\times}3{\times}2{\times}1)}$ $\require{cancel} _6C_2=\dfrac{6 {\times} 5 {\times}\cancel{4 {\times}3{\times}2{\times}1}}{(2{\times}1)\cancel{(4{\times}3{\times}2{\times}1)}}$ $_6C_2=\dfrac{30}{2}$ $_6C_2=15$ $_6C_3=\dfrac{6!}{3!(6-3)!}$ $_6C_3=\dfrac{6!}{3!(3!)}$ $_6C_3=\dfrac{6{\times}5{\times}4{\times}3{\times}2{\times}1}{(3{\times}2{\times}1)(3{\times}2{\times}1)}$ $\require{cancel} _6C_3=\dfrac{\cancel{6}{\times}5{\times}4{\times}\cancel{3{\times}2{\times}1}}{(\cancel{3{\times}2}{\times}1)\cancel{(3{\times}2{\times}1)}}$ $_6C_2=20$ Therefore $_6C_2+_6C_3 =15+20=35$ The answer is $35$.
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