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Decide whether each of the following sentences is valid, unsatisfiable, or neither. Verify your decisions using truth tables OR the equivalence rules of Figure 7.11

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Decide whether each of the following sentences is valid, unsatisfiable, or neither. Verify your decisions using truth tables OR the equivalence rules of Figure 7.11 (page 249) a. Smoke - Smoke b. Smoke - Fire c. Smoke v Fire V-Fire d. Big V Dumb V (Big- Dumb)

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