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Question: Answered & Verified by Expert
The output $(X)$ of the logic circuit shown in figure will be

PhysicsSemiconductorsNEETNEET 2013 (All India)
Options:
  • A $X=\overline{\bar{A}} \cdot \overline{\bar{B}}$
  • B $X=\overline{A \cdot B}$
  • C $X=A \cdot B$
  • D $X=\overline{A+B}$
Solution:
2170 Upvotes Verified Answer
The correct answer is: $X=A \cdot B$
$X=\overline{\overline{A B}}=A \cdot B$ (i.e., AND gate)
If the output $X$ of NAND gate is connected to the input of NOT gate (made from NAND gate by joining two inputs) from the given figure then we get back an AND gate.

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