Question

I need help please and thank you

Answer 1

There are
`4` unique ways in which three-topping meat pizza can be made.

Explanation:

Let number of items that pizza restaurant has
`(n)` is
`4`. That are hamburger, pepperoni, Canadian bacon, and sausage.

Also, it asks for three-topping meat pizza. It means
`(k)=`
`3`

Plugging these value in the formula we get,

`_nC_k=(n\ !)/(k\ !(n-k)\ !)\\\\_4C_3=(4\ !)/(3\ !(4-3)\ !)\\ \\_4C_3=(4*3*2*1)/(3*2*1(1\ !))\\\\_4C_3=(24)/(6*1) \\\\_4C_3=4`

So, there are
`4` unique ways in which three-topping meat pizza can be made.