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Question: Answered & Verified by Expert
Which of the following statements is a tautology?
MathematicsMathematical ReasoningJEE MainJEE Main 2023 (01 Feb Shift 2)
Options:
  • A pppq
  • B pq~pq
  • C ppq~q
  • D ppq
Solution:
1252 Upvotes Verified Answer
The correct answer is: pq~pq

We know,

AB~AB

Now solving all options one by one we get,

A pppq

~pp~pq

~pfpq

~p pq~pp~pq

~p  q

Which is not a tautology

B pq~pq

~pqpq

~p~qpq

~pp~qq

TTT

Tautology

C ppq~q

~p~pq~q

~pq~q

~p~q

Which is not a tautology

D ppqp

Which is not a tautology

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