Question

Between two book-ends in your study are displayed your five favourite puzzle books. If you decide to arrange the five books in every possible combination and moved just one book every minute, how long would it take you ?

Answer 1

@ajprincess @texaschic101 @ikram002p

Answer 2

5! is the possible combination
i guess it will take 5!×5! time
but not sure

Answer 3

2 hrs.
5 x 4 x 3 x 2 x 1 = 120 minutes = 2 hrs

Answer 4

but why we take 5 !.
Why we use factorial here ?

Answer 5

@Callisto @Luigi0210

Answer 6

It's a combinations problem~

Answer 7

if we solve it simply

Answer 8

then

Answer 9

@eliassaab