Question: 9.1.7 Show that if S,, is a binomial random variable, then for k = 1 , 2 , . . . , n, (n -

9.1.7 Show that if S,, is a binomial random variable, then for k = 1 , 2 , . . . , n,

(n - k + l ) p k ( 1 - P)

P{S, = k } = P{S, = k - 1).

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