Evaluate the expression. C(4, 2) · C(9, 7) / C(13, 9)

Question

Can I get some help with working out this problem, Thank you in advance!

C(4, 2) · C(9, 7)

C(13, 9)

Answer 1

Hi Penelope,

There is also a formula for this: C(n,k) = n! / [k! * (n-k)! ]

I told you what n! means in your other post.

So like the other problem you asked, you just need to plug in the numbers into the formula.

[C(4,2) * C(9,7)] / [C(13,9)] = [4!/(2! 2!) * 9!/(7! 2!)] / [13!/(9! 4!)]

Where are you getting stuck?