Question: Q 1 . ( a ) ( i ) Briefly explain what it means for a set of propositional formulae to be satisfiable. ( ii

Q1.(a)(i) Briefly explain what it means for a set of propositional formulae to be
satisfiable.
(ii) Give an example (with justification) of a set U of propositional formulae
such that each formula in U is satisfiable but U itself is not. [4 marks]

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