Which of the following statement is a co...

Which of the following statement is a contingency?

A

`(pwedge~q)vee~(pwedge~q)`

B

`(pwedgeq)harr(~prarr~q)`

C

`(~qwedgep)vee(pvee~p)`

D

`(qrarrp)vee(~pharrq)`

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