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JEE Main 2022 Mathematics question

MathematicsProbabilityJEE Main 2022

The mean and variance of a binomial distribution are and respectively. If P(X = 1) = 4/243, then P(X = 4 or 5) is equal to :

Answer: (3)

Solution

np = and npq = , so q = 1/3 and p = 2/3. Then gives n = 6. So

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Question ID VK-025179