Answer
6! = 720
11! = 39916800
(7-2)! = 120
(15-5)! = 3628800
$8C2$ = 28
$5C0$ = 1
$5C5$ =1
$6C4$ = 15
$11C7$ =330
$9P6$ = 60480
$12P8$ = 19958400
Work Step by Step
6! = $6*5*4*3*2*1$
=720
11! = $11*10*9*8*7*6*5*4*3*2*1$
=39916800
(7-2)!
=(5)!
= $5*4*3*2*1$
=120
(15-5)!
=10!
= $10*9*8*7*6*5*4*3*2*1$
= 3628800
$8C2$
= $\frac{8!}{2!(8-2)!}$
= 28
$5C0$
=$\frac{5!}{0!(5-0)!}$
= 1
$5C5$
=$\frac{5!}{5!(5-5)!}$
=1
$6C4$
=$\frac{6!}{4!(6-4)!}$
= 15
$11C7$
=$\frac{11!}{7!(11-7)!}$
=330
$9P6$
=$\frac{9!}{(9-6)!}$
= 60480
$12P8$ =
=$\frac{12!}{(12-8)!}$
= 19958400