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P(X1X2 = 0) = 1 的意思是:X1、X2至少有一个为零。
所以,当 X1 = -1 或 1 时,X2 = 0
当 X2 = -1 或 1 时,X1 = 0
所以,若要 X1 = X2,只能是 X1 = X2 = 0
所以:P(X1 = X2) = P(X1 = X2 = 0)
P(X2 = 0) = P(X1 = -1, X2 = 0) + P(X1 = 0, X2 = 0) + P(X1 = 1, X2 = 0)
由前所述:当 X1 = -1 或 1 时,X2 = 0,也就是:
P(X1 = -1, X2 = 0) = P(X1 = -1) = 1/4
P(X1 = 1, X2 = 0) = P(X2 = 1) = 1/4
所以:P(X2 = 0) = 1/4 + P(X1 = 0, X2 = 0) + 1/4
解得:P(X1 = 0, X2 = 0) = 0
所以:P(X1 = X2) = P(X1 = X2 = 0) = 0
选A。
所以,当 X1 = -1 或 1 时,X2 = 0
当 X2 = -1 或 1 时,X1 = 0
所以,若要 X1 = X2,只能是 X1 = X2 = 0
所以:P(X1 = X2) = P(X1 = X2 = 0)
P(X2 = 0) = P(X1 = -1, X2 = 0) + P(X1 = 0, X2 = 0) + P(X1 = 1, X2 = 0)
由前所述:当 X1 = -1 或 1 时,X2 = 0,也就是:
P(X1 = -1, X2 = 0) = P(X1 = -1) = 1/4
P(X1 = 1, X2 = 0) = P(X2 = 1) = 1/4
所以:P(X2 = 0) = 1/4 + P(X1 = 0, X2 = 0) + 1/4
解得:P(X1 = 0, X2 = 0) = 0
所以:P(X1 = X2) = P(X1 = X2 = 0) = 0
选A。
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