| A. | Contradiction |
| B. | Valid |
| C. | Well-formed formula |
| D. | None of these |
Answer : D Explanation : Nilanshi Chauhan said: (7:09pm on Sunday 22nd October 2017)
It is a tautology.
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Option: A Explanation : Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here. |
