Use a binomial expansion to simplify:

a) (10c0)+(10c1)3+(10c2)3^2+...+(10c10)3^10

b) (nc0)-(nc1)+(nc2)-(nc3)+...+(-1)^n (ncn)

c meaning chose

Any help would be greatly appreciated, I seem to be struggling quite alot with this topic but hopefully after this question I will be professional.

Thx in advance