In how many ways can 4 books be arranged on a shelf if there are 8 books to choose from?

Question

asked Oct 24, 2022 74.0k views

2 Answers

Matuszew · Answer 1 · 2022-10-29T15:53:25+0000

Answer:

1680 ways

Explanation:

By using the formula for permutation, which is nPr=n!/(n-r)!,

8P4=8!/(8-4)!

=8!/4!

=8×7×6×5

=1680

Or if you just want to use the multiplication rule (which is simpler).

8×7×6×5=1680