1.

Examine whether the following statement pattern is tautology, contradiction or contingency : p ∨ – (p ∧ q).

Answer»

We make the truth table as follows

PqP ∧ q – (P ∧ q)Pv – (P ∧ q)
T
T
F
F		T
F
T
F		T
F
F
F		F
T
T
T
 		T
T
T
T
 

So the final statement is always true. So it is a tautology.


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