Which of the following statement is a co...

Which of the following statement is a contingency?

A

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

B

`(p ^^ q) harr (~ p to ~q)`

C

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

D

`(q to p) vv (~q harr q)`

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The correct Answer is:

B

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