Computer Sciences > Gate 2019 > Propositional Logic
Which one of the following is NOT a valid identity?
A
(x⊕y) ⊕z = x⊕(y ⊕ z)
B
(x + y) ⊕z = x ⊕ (y + z)
C
x ⊕ y = x + y, if xy = 0
D
x ⊕ y = (xy + x′y′)′

Correct : b

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