Which of the followings logical implications are tautology? Choose the correct…

Which of the followings logical implications are tautology?

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Choose the correct answer from the options given below:

  1. A & B Only

  2. B & D Only

  3. A, B & C Only

  4. B, C & D Only

  1. A.

    1

  2. B.

    2

  3. C.

    3

  4. D.

    4

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