Question

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

Answer 1

Answer:

1680 ways

Step-by-step 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

Answer 2

Answer:

im pretty sure its  

1680

Step-by-step explanation: