Mike D. answered • 5d

Effective, patient, experienced math tutor who can help you succeed

Arleth

In a binomial experiment p(N) = n C N p^{N} (1-p)^{n - N }

n C N is the number of ways of choosing N things from n.

So here n = 9, N = 4, p=0.1. Hopefully you can finish this off now.

9 C 4 = 9 ! / (4 ! 5 !)

Mike

Tom K.

5d