1. (5.0分) 设随机变量 X_(i)sim(}-1&0&11)/(4)&(1)/(2)&(1)/(4)),i=1,2 且满足P(X_(1)X_(2)=0)=1，则P(X_(1)=X_(2))=( )A. 0B. 1/4C. 1/2D. 1

1. (5.0分) 设随机变量 $X_{i}\sim\left(\begin{matrix}-1&0&1\\\frac{1}{4}&\frac{1}{2}&\frac{1}{4}\end{matrix}\right),i=1,2$ 且满足$P(X_{1}X_{2}=0)=1$，则$P(X_{1}=X_{2})=( )$

A. 0

B. 1/4

C. 1/2

D. 1