In how many ways can 7 persons be seated in a row if two persons alway – InterviewSolution

1.

In how many ways can 7 persons be seated in a row if two persons always occupy the end seats.

Answer»

Two person always occupy the end seats they can be permuted in 2! ways & the remaining 5 can be permutted in 5! ways.

∴ The total number ways = 5! × 2! = 240 ways.

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