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

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

In how many ways can 7 exmination paopers be arranged so that the best and the worst papers are never together?

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

In how many ways can 10 examination papers be arranged so that the best and the worst papers never come together?

In how many ways can 12 examination papers be arranged so that the best and the worst papers may never come together ?

In how many ways can 10 examination papers be arranged so that the best and worst papers never come together?

In how many ways can 10 examination papers be arranged so that the best and worst papers never come together?

(i) How many words can be formed with the letters of the word 'FAILURE', if A and F are always together? (ii) In how many ways can 6 question papers be arranged if the best and worst papers are always together?