Which of the following is not true?...

Which of the following is not true?

A

`~(p harr q) equiv(p ^^~ q) vv(~ p ^^ q)`

B

`p rarr(q ^^ r) equiv(p rarr q) ^^(p rarr r)`

C

`[(p rarr q) ^^(q rarr r)] rightarrow p rarr r` is a tautology

D

(~p` ^^ ~ q) harr (p rarr q) is a tautology

Text Solution

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The correct Answer is:

D

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