## anonymous 3 years ago how do you evaluate C(9,7)

1. amistre64

P(9,7)/7!

2. amistre64

9.8.7.6.5.4.3 ------------ 7.6.5.4.3.2.1 simplify to your hearts desire

3. anonymous

C(n,k) can also be written: $C(n,k) = \frac{n!}{k!(n-k)!}$

4. anonymous

What's The Answer ? A) 181,440 B)72 C)36 D)63

5. amistre64

please dont ask for an answer that you can work out for yourself ...

6. amistre64

$C(n,k) = \frac{n!}{k!(n-k)!}$ $C(n,k) = \frac{n!/(n-k)!}{k!}$ $C(n,k) = \frac{P(n,k)}{k!}$

7. anonymous

$C(9,7) = \frac{9!}{7!(9-7)!} = \frac{9!}{7!2!} = \frac{7!*8*9}{7!2!} = \frac{8*9}{2}$

8. anonymous

Thanks (: really Appreciate it..