Question

Simplify 15C3

A. 182
B. 455
C. 2,730
D. 910
*Ok alright I SWEAR this is the LAST one*

Answer 1

Do you know how to do choose operation?

Answer 2

No.. sorry :(

Answer 3

Do you remember how to do P operation?

Answer 4

v.v no.. :(

Answer 5

why don't you learn how to do it?

Answer 6

I tried to show you before.

Answer 7

\[
^nC_k = \frac{^nP_k}{k!}
\]

Answer 8

\[
k! = 1\times 2\times 3\times \ldots \times k
\]

Answer 9

\[
^nP_k = \frac{n!}{(n-k)!} = n\times (n-1) \times (n-2)\times \ldots \times (n-k+1)
\]

Answer 10

ok I'm gonna try to figure this out.

Answer 11

I got 455.

Answer 12

:O I got it right on my test. THANK YOU!! :)