Question

In how many ways 9 examination papers be arranged so that the best and the worst papers are never togther?

Answer 1

Sol:

Total number of arrangements that can be made in 9 papers = 9! Ways.

Let the Best and Worst paper together as one unit and remaining 7 can be 7 units.These can be arranged amongst themselves as 8! Ways.

In each of these arrangements the Best and Worst paper together can be arranged amongst themselves as 2! Ways.

Therefore, total number of arrangements in which the Best and Worst paper together are 8!2! ways.

Hence number of arrangements two particular things are never together = 9! - 8!2!.

Answer 2

you can use roll no of examination paper to do so.

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