In how many ways can 9 examination papers be arranged

Asked by admin @ 02/08/2021 in Math viewed by 310 People

In how many ways can 9 examination papers be arranged so that the best and the worst papers are never together.

Answered by admin @ 02/08/2021

The number of ways 9 papers can be arranged in 9! ways.

The best and work papers as 1 unit = 9! - 1!

= 8!.

The best and worst papers can be arranged themselves in 2! ways.

Total Number of ways = 9! - 8! * 2!

= 362880 - 80640

= 282240.

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