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Question

Which of the following statements is not a tautology?
  1. (pq)p
  2. pq( p)q
  3. (pq)(p( q))
  4. p(pq)


Solution

The correct option is C (pq)(p( q))
pqpqpqpq(p)qp(q)pq( p)q(pq)pp(pq)(pq)(p( q))TTTTFFTTTTTTTFFTFTFTTTTTFTFTTFTFTTTFFFFFTTTTTTTT

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