Discrete Maths - Propositional and first order logic

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16. ˥(P → Q) is equivalent to

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Option : A
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17. In propositional logic , which of the following is equivalent to p → q?

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Option : B
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18. Which of the following is FALSE?
Read ^ as And, v as OR, ~as NOT, →as one way implication and ↔ as two way implication?

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Option : D
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19. Which of the following well-formed formula(s) are valid?

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Option : A
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20. The correct prefix formula is

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Option : C
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Propositional and first order logic

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