A yogurt shop offers 6 different flavors of frozen yogurt and 12 different toppings. How many choices are possible for a single serving of frozen yogurt with one topping? I'LL FAN AND MEDAL

Question

bloomlocke367 · Answer

@iGreen

bloomlocke367 · Answer

I have 2 formulas but I don't know which one to use..

igreen · Answer

I think we use this one:

$\dfrac{n!}{r!(n - r)!}$

bloomlocke367 · Answer

Okay..  what goes where?
like, what's n and what's r?

igreen · Answer

Oh, wait..that's wrong..

igreen · Answer

We just multiply 6 * 12.

bloomlocke367 · Answer

why?

bloomlocke367 · Answer

so it's 72?

igreen · Answer

Yep, you got it.

bloomlocke367 · Answer

But why don't you use the formula?

igreen · Answer

Because that formula is only for choosing things that are the same..like:

5 students out of a set of 20

igreen · Answer

But these are two different things..yogurt and pizza topping..

bloomlocke367 · Answer

okay.. well when do you use $$\frac{ n! }{ (n-r)! }$$