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Question

Which of the following statement pattern is a tautology?

A
p(qp)
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B
qp
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C
(qp)(pq)
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D
pp
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Solution

The correct option is B (qp)(pq)
(A) p(qp)p(qp)ppq
pq

(B) qpqp
(D) ppF

So left is (C)
(C)
pqqpppq(qp)(pq)
T T T F F T
TFTF T T
FTFT T T
FFTT F T

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