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प्रश्न
Using the truth table prove the following logical equivalence.
[∼ (p ∨ q) ∨ (p ∨ q)] ∧ r ≡ r
तक्ता
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उत्तर
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| p | q | r | p ∨ q | ∼ (p ∨ q) | ∼ (p ∨ q) ∨ (p ∨ q) | [∼ (p ∨ q) ∨ (p ∨ q)] ∧ r |
| T | T | T | T | F | T | T |
| T | T | F | T | F | T | F |
| T | F | T | T | F | T | T |
| T | F | F | T | F | T | F |
| F | T | T | T | F | T | T |
| F | T | F | T | F | T | F |
| F | F | T | F | T | T | T |
| F | F | F | F | T | T | F |
The entries in columns 3 and 7 are identical.
∴ [∼ (p ∨ q) ∨ (p ∨ q)] ∧ r ≡ r
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