Which of the following is not a valid rule of XOR?
(A) 0 XOR 0 = 0
(B) 1 XOR 1 = 1
(C) 1 XOR 0 = 1
(D) B XOR B = 0


Answer: (B)

Explanation: XOR gate only returns 1 as the output when both inputs are different and in every other case, it returns 0.
So, options (A), (C) and (D) are correct.
Option (B) is incorrect.

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