Which of the following expressions is not equivalent to NOT X, denoted X′?

GATE · 1999 · CS · Question 1 subparts

Which of the following expressions is not equivalent to NOT X, denoted X′?

  1. A.

    X NAND X

  2. B.

    X NOR X

  3. C.

    X NAND 1

  4. D.

    X NOR 1

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