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For a binomial variable with n = 5, P(X = 4) = P(X = 3). Find p.

A1/2
B3/5
C3/4
D2/3
Answer & Solution
Correct answer: D. 2/3
5p^4 q = 10p^3 q^2 gives p = 2q, so p = 2/3.
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