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5. (15pts) A formula is valid if and only if it computes True for all its valuations; it is satisfiable if and only if it
5. (15pts) A formula is valid if and only if it computes True for all its valuations; it is satisfiable if and only if it computes True for at least one of its valuations. Is the formula of the parse tree below valid? Is it satisfiable? Explain. 1
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