Published by:
CGP EDU Academic Team
Published on: August 14, 2026
A six faced die is biased such that 3 x P(a prime number) = 6 x p(a composite number) = 2 x 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
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Let 
So, P(a prime number) = 2k,
P(a composite number) = k,
& P(1) = 3k
&3x2k + 2xk + 3k=l
P(success) = P(1 or 4) = 3k + k = 
Number of trials, n = 2
mean = np= 2x 
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