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When does the output of a NAND gate = 1?

  • A.Whenever a 0 is present at an input
  • B.Only when all inputs = 0
  • C.Whenever a 1 is present at an input
  • D.Only when all inputs = 1

Answer: A

Correct answer: Whenever a 0 is present at an input

NAND is the complement of AND. AND is 0 as soon as any input is 0, so NAND is 1 in that case, and it is 0 only when every input is 1.

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