Jim earns 3% commission every month on his total sales. This month, his total sales were $620,000. How much commission did Jim earn? Group of answer choices

A-$18,600

B-$20,600

C-$206,000

D-$186,000

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.