Theorem 7-10. If X is a random variable which assumes only integral values with probability distribution : P (X = k) = Pr; k = 0, 1, 2, ... and P (X > k) = qk, k 2 0 so that %3D k 9k = Pk+ 1+ Pk+2 + ... = 1-2 pi, and two generating functions are : i=0 P (s) = Po + P1s + P2 s² + ... Q (s) = 90 + 91 s + 92 s² + .. and then for -1

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