SOLUTION: In how many ways may a group of 10 people be seated in a row with exactly 10 chairs if 2 people must be seated together?

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Question 369191: In how many ways may a group of 10 people be seated in a row with exactly 10 chairs if 2 people must be seated together?
Answer by sudhanshu_kmr(1152) About Me  (Show Source):
You can put this solution on YOUR website!

assume that two particular people are single entity then total 9 people

no. of ways = 9! * 2