Question

In how many ways can letters of the

word PERMUTATIONS be arranged so that there are not 4 letters between M and N ?

Answer 1

there are always 4 letters between P and S . here you can see that P and S having 4 places between them can be filled in 7 ways . hence, P and S or S and P can be filled in (7+7) ways .

Answer 2

see the above answer

That is right