What does the expression 5-n represent
A. 5 less then some number
B. Some number less than 5
C. Some number more than 5
D. 5 more then some number
-not dannie/ her little sister-

Let x have probability generating function gx (s) and let un generating function u(s) of the sequence uo, u1, satisfies p(x > n). show that the (1- s)u(s) = 1 - gx(s), whenever the series defining these generating functions converge.