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

Question

In how many ways can 9 examination papers be arranged so that the best and the worst papers are never together?, 9 ! − 2 ! × 7 !, 9 ! − 2 ! × 8 !, 9 ! − 8 !, 9 ! − 7 !

MARKS App · Accepted Answer

The number of ways in which 9 papers can be arranged are 9 ! ways. Take Best and Worst papers as one unit then, 9 - 1 ! = 8 ! The best and worst papers can arrange themselves in 2 ! ways. Total number of ways = 9 ! - 2 ! × 8 !

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