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How does reflecting or rotating a figure change the interior angles of the figure?

Caitlin had 402. in her bank account.she withdrew $15.each week to pay for swimming lesson. she now has $237.

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.