Let X1,X2X_1, X_2X1,X2 be i.i.d. U(0,1)U(0, 1)U(0,1). Find P(X1+X2≤0.5)P(X_1 + X_2 \le 0.5)P(X1+X2≤0.5).
1/2
1/4
1/8
1/16