Q. 21 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′)′
Answer: (B)
Explanation:
Q. 21 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′)′
Answer: (B)
Explanation:
