Which represents the inverse of the function f(x) = 4x? • h(x) = x + 4
• h(x) = x-4
•h(x) = =x
•h(x) = =x

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.