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A six faced die is biased such that 3 × P(a prime number) = 6 × P(a composite number) = 2 × P(1).

Let X be a random variable that counts the number of times one gets a perfect square on some throws of this die. If the die is thrown twice, then the mean of X is :

(A) \(\frac 3{11}\)

(B) \(\frac 5{11}\)

(C) \(\frac 7{11}\)

(D) \(\frac 8{11}\)

1 Answer

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by (53.7k points)
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Best answer

Correct option is (D) \(\frac 8{11}\) 

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