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8. Let X1, X 2, X3 be a random sample of size 3 from a distribution with probability mass function f (x) = 1/4, x

8. Let X1, X 2, X3 be a random sample of size 3 from a distribution with probability mass function f (x) = 1/4, x = 1,2,3,4. Find the probability mass function of Y = X1 + X 2 + X3

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