Question

A pizza restaurant offers nine choices of vegetarian toppings for pizza. In how many ways can you choose four toppings?

A.3024 B. 126 C. 362,880 4.15,120

Answer 1

We check the following points

1. The order does not matters

2. No repetition

3. we cannot choose all the available choices. we need to select only 4

If order does not matters then we use combination

Formula is nCr =
`(n!)/(r!(n-r)!)`

We choose 4 from 9

So 9C4 =
`(9!)/(4!(9-4)!)`

=
`(9!)/(4!(5)!)` = 126 ways