In order to get low output from the following logic circuit, the possible…

2025

In order to get low output from the following logic circuit, the possible inputs are

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  1. A.

    A-1, B-1, C-0

  2. B.

    A -1, B-1, C-1

  3. C.

    A-0, B-0, C-1

  4. D.

    A-0, B-0, C-0

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Show answer & explanation

Correct answer: C

First, analyze the final NAND gate. For its output Y to be Low (0), both inputs must be High (1). This means input C must be 1, and the output from the NOR gate must also be 1. Next, look at the NOR gate. For a NOR gate to output High (1), all its inputs must be Low (0). Therefore, inputs A and B must both be 0. The required input combination is A=0, B=0, C=1.

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