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9. (a) Show that the following formula in CNF is unsatisfiable: (b) Show that the following formula in CNF is unsatisfiable Can you find an

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9. (a) Show that the following formula in CNF is unsatisfiable: (b) Show that the following formula in CNF is unsatisfiable Can you find an easier argument than just writing the entire truth table? (c) Generalize the above to some class of CNF formulas on an arbitrary numbern 2'1 of proposition letters, and prove it by induction on n

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