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Question

Number of ways in which 7 people can occupy six seats, 3 seats on each side in a first class railway compartment if two specified persons are to be always included and occupy adjacent seats on the same side is (5!)×k, then value of k is

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Solution

Excluding the two specified people, 4 others can be selected in 5C4 ways.
The two adjacent seats can be taken in 4 ways and the two specified people can be arranged between themselves in 2! ways, remaining 4 people can be arranged in 4! ways.
5C44(2!)(4!)=8(5!)

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