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The output of an exclusive-OR gate is HIGH if ________.

  • A.all inputs are LOW
  • B.all inputs are HIGH
  • C.the inputs are unequal
  • D.none of the above

Answer: C

Correct answer: the inputs are unequal

XOR is the inequality detector: it gives 1 when its two inputs differ and 0 when they agree. With more than two inputs it gives 1 when an odd number of them are 1, which is the same rule generalised.

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