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X ~ B(6, p) with P(X = 2) = P(X = 4). Find p.
A1/4
B1/2
C2/3
D1/3
Answer & Solution
Correct answer: B. 1/2
15 p^2 q^4 = 15 p^4 q^2 gives q^2 = p^2, so p = q = 1/2.
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