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Which of the following propositions is a...

Which of the following propositions is a tautology ?

A

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

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
A
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