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6. Check if the following conditional statements is a tautology. If yes, prove it. If not, explain why. a) [(pVg) ( pr) ( gr)]-- b)

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6. Check if the following conditional statements is a tautology. If yes, prove it. If not, explain why. a) [(pVg) ( pr) ( gr)]-- b) p (pVg)] c) (-9) 19-r)] ( pr) d) [p A (p0)]-9

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