1.

~(~p) ↔ p is (A) a tautology (B) a contradiction (C) neither a contradiction nor a tautology (D) none of these

Answer»

Correct option: (A) a tautology

p~p~(~p)~(~p) ↔ p
TFTT
FTFT

All the entries in the last column of the above truth table is T.

∴ ~(~p)  p is a tautology.



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