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Question

Which of the following is a fallacy?

A
(p q)(pq)
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B
p( p q)
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C
(pq)p
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D
None of these
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Solution

The correct option is A (p q)(pq)
(pq)(p q)=(p q)(p q) [ (p q)= p q]=(p p)(q q)
(p p) and (q q) are always false.
(p p)(p q) is false for all values of p and q.
Hence, it is a fallacy.

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