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Question: In how many ways can 7 people sit in 7 chairs?


A ) 5041
B ) 720
C ) 5040
D ) 40320

Steps to derive

1 Number of ways in which 7 people can sit in 7 chairs = 7P7

2 = 7! = 7 ×6 ×5 ×4 ×3 ×2 ×1 = 5040
 [Simplify.]

3 7 people can sit in 7 chairs in 5040 ways.



Hence the right answer is Option C

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