Discrete Mathematics - Mathematical Logic

6. Let a, b, c, d be propositions. Assume that the equivalence a ↔ (b v ˥b) and b ↔ c hold. Then truth value of the formula ( a ^ b) → ((a ^ c) v d) is always

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7. Which of the following is a declarative statement?

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8. P → (Q → R) is equivalent to

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9. Which of the following are tautologies?

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10. If F1, F2 and F3 are propositional formulae such that F1 ^ F2 → F3 and F1 ^ F2→F3 are both tautologies, then which of the following is TRUE?

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