Christine wants to invite three of her friends from four married couples to play tennis with her. How many ways can she invite them if a) one particular couple will not attend separately ? ans is 26 b)2 of her friends are not comfortable with each other and will not attend together? ans is 50 c) None of the three friends she invited are husband and wife? ans is 32

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Christine wants to invite three of her friends from four married couples to play tennis with her. How many ways can she invite them if

a) one particular couple will not attend separately ? ans is 26

b)2 of her friends are not comfortable with each other and will not attend together? ans is 50

c) None of the three friends she invited are husband and wife? ans is 32

PLEASE GIVE VERY VERY DETAILED EXPLANATION THANK YOU!!!

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