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If P and Q are two statements, then whic...

If P and Q are two statements, then which of the following compound statement is a tautology?

A

`(P rArr Q) ^^ ~ Q) rArr Q`

B

`(P rArr Q) ^^ ~ Q) rArr P`

C

`(P rArr Q) ^^ ~ Q) rArr (P ^^ Q)`

D

`(P rArr Q) ^^ ~ Q) rArr ~ P`

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