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MHT CET 2022 Mathematics question

MathematicsProbabilityMHT CET 2022

If the p.m.f. of a discrete random variable X is , x = 1, 2, 3 = 0, otherwise then E(X) is equal to

Answer: (D)

Solution

The probabilities must add to 1: . Now , so . Then \sum$

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Question ID VK-094317