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Which of the following is always true ?...

Which of the following is always true ?

A

`(p rarr q) ~= (~q rarr ~p)`

B

`~(p vv q) ~= (~p vv ~q)`

C

`~(p rarr q) ~= (p vv ~q)`

D

`~(p ^^ q) ~= (~p ^^ ~q)`

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