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8. Let X1, X2, 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

8. Let X1, X2, 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 p.m.f of Y = X1 + X2 + X3

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