The false statement in the following is...

The false statement in the following is

A

`p ^^ (~ p) ` is a contradiction

B

`p vv ( ~p)` is a tautology

C

`~(~p) harr p` is tautology

D

`(p to q) harr (~q to ~p) ` is a contradiction

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The correct Answer is:

D

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