1.

The proposition (p → q) ↔ ( ~p → ~q) is a (A) tautology (B) contradiction (C) contingency (D) none of these

Answer»

Correct option: (C) contingency 

pqp → q~p~q~p → ~q(p → q) ↔
(~p → ~q)
TTTFFTT
TFFFTTF
FTTTFFF
FFTTTTT


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