Can someone break this down for me!! I'm stuck
it's an example the answer is 220

how do you get 220?!

Step-by-step explanation:

Recall the definition for the combination symbol with the use of factorial (symbol !):

Therefore, for the case where n = 12 and k = 9, we have:

attachment?

step-by-step explanation:

b) 1/3 * 1/5

step-by-step explanation:

each smallest part is 1/15 since the written one is 1/5 and it's divided by 3 equal parts. (1/5 )/3 = 1/15 = 1/3 * 1/5