ISRO Electrical Engineering (EE) 2018 - Question 60

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What is the output of XOR gate with A and B as input?

  • A. (AB)' + AB, i.e. NOT(AB) + AB
  • B. NOT(A + B) · (A + B)
  • C. (A + B) · NOT(AB)
  • D. NOT(A + B) + AB

Answer: C. (A + B) · NOT(AB)

Explanation: By Boolean algebra: A ⊕ B = A·B' + A'·B = (A + B)·(A' + B') = (A + B) · (AB)' = (A + B) · NOT(AB).

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