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Question

Which of the following is a tautology?
(a) p (q ~ q)
(b) p (~q p)
(c) p (p p)
(d) (p ~ p) q


Solution

p  ( ∼ q) is a tautological statement, if assertion is true in all possible interpretation. 

Hence, the correct answer is option A.

Mathematics
RD Sharma XI (2019)
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