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If p is any statement, t and c are a tau...

If p is any statement, t and c are a tautology and a contradiction respectively then which of the following is not correct- (a) `p ^^ t=p` (b) `p ^^ c=c` (c) `p vv t=c` (d) `p vv c=p`

A

p`vv`(~p)=c

B

p`vv` t= t

C

p`^^`t = p

D

p`^^`c = c.

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The correct Answer is:
A
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