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A positive AND gate is also a negative

  • A.NAND gate
  • B.NOR gate
  • C.AND gate
  • D.OR gate

Answer: D

Correct answer: OR gate

In negative logic the roles of the two voltage levels are exchanged, and by De Morgan's law that turns AND into OR: \( (A'\cdot B')' = A + B \). So a gate that is AND for positive logic is OR for negative logic.

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