Answer:
126
Step-by-step explanation:
Use the formula...
9!(9-4)!(4)!
C(n,r) = n! / (r!(n−r)!)
9 C 4
= 9! / (4!(9 - 4)!)
= 9 x 8 x 7 x 6 x 5! / 4 x 3 x 2 x 1 x 5!
= 3024 / 24
= 126
