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Let X =( X1, X2, X3 ) have the joint pdf f(x1, x2, x3)=60x1x22, where x1...

Let X =( X1, X2, X3 ) have the joint pdf f(x1, x2, x3)=60x1x22, where x1 + x2 + x3=1 and xi >0 for i = 1,2,3. find the distribution of X1 ? Find E(X1).

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