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Q.

In how many ways can 24 persons be seated round a table, if there are 13 seats ?

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a

24!13×11!

b

20!10×11!

c

14!18×11!

d

15!10×11!

answer is A.

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Detailed Solution

Total number of persons = 24

Total number of sets = 13

In case of circular table, the clockwise and anti-clockwise orders are different, the required number of circular permutations =P13   2413 =24!13×11!.

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