Question

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

Answer 1

If 4 books are chosen out of 8 books, they can be arranged as

`C(8,4) = \frac{8}{} C\frac{}{4} = (8!)/(4!(8 - 4)!) = (8!)/(4 !* 4!)= 70`

In 70 ways the books can be arranged.

70 is the right answer.

Answer 2

• 70 ways

Explanation:

4 books out of 8 can be arranged in:

• 8!/(8-4)!*4! =
• 8*7*6*5/2*3*4 =
• 70 ways