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What is the Boolean expression for a four-input OR gate?

  • A.Y = A + B + C + D
  • B.Y = A· B · C · D
  • C.Y = A - B - C - D
  • D.Y = A $ B $ C $ D

Answer: A

Correct answer: NAND

By De Morgan's law \( \overline{A}+\overline{B} = \overline{A\cdot B} \), which is the NAND function. It is the expression for a NAND written with the inversion pushed inwards onto the variables.

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