Let X1,X2 and X3 be i.i.d. U(0,1) random variables. Then E(X1+X2/X1+X2+X3) equals

Q7Section A (Section A)7 of 60

Expected ratio of partial sum to total

Let $X_1,X_2$ and $X_3$ be i.i.d. $U(0,1)$ random variables. Then $E\left(\dfrac{X_1+X_2}{X_1+X_2+X_3}\right)$ equals

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