Marie and her crush together with their 5 classmate are to be arrange in a row of 7 chairs for a photo opportunity. What is the probability that marie will be seated beside her crush
Answers
Given : Marie and her crush together with their 5 classmate are to be arrange in a row of 7 chairs for a photo opportunity.
To Find : the probability that marie will be seated beside her crush
Solution:
Marie and her crush together with their 5 classmate
Hence in total 7
7 people can be arranges in 7 ! ways
Lets Assume that marie will be seated beside her crush
Hence taking them as a group and they can sit in 2 ways
Now 1 group of them + 5 more people = 6
Hence can be arranged in 6! * 2 Ways
Probability that marie will be seated beside her crush = 6! * 2 / 7 !
= 2/7
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