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Question 13 A coin, having probability p of landing heads, is flipped until a head appears for the nth time. Let N denote the number

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Question 13 A coin, having probability p of landing heads, is flipped until a head appears for the nth time. Let N denote the number of flips required. Calculate E(N) and Var(X). In particular, calculate these two quantities for n = 5 and p = 1/2

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