Question: As before, note that X k=n k 1 n 1 pnqkn = pn X l=0 n +l 1 l
As before, note that
∞X k=n
k − 1 n − 1
pnqk−n = pn ∞X l=0
n +l − 1 l
ql where l = k − n
= pn ∞X l=0
−n l
(−q)l
= pn(1 − q)−n = 1, using the binomial expansion of (1 − q)−n, see Theorem A.3.
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