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If p and q are two statements, then (p r...

If p and q are two statements, then `(p rArr q) iff (~q rArr ~ p)` is

A

contradiction

B

tautology

C

Neither (a) nor (b)

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
We know that if p and q are two statements, then
`(pimpliesq)iff(~qimplies-p)` is a tautology.
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