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Question
Examine whether the following statement pattern is tautology, contradiction or contingency :
p ∨ – (p ∧ q)
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Solution
We make the truth table as follows
| P | q | P ∧ q | – (P ∧ q) | Pv – (P ∧ q) |
| T | T | T | F | T |
| T | F | F | T | T |
| F | T | F | T | T |
| F | F | F | T | T |
So the final statement is always true. So it is a
tautology.
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