27. Logical Deduction with Variables Given the statements: P and Q (Q or R), if P then S, not S, if R then A, not A. What can you conclude? Added 20 June 2011 Show Solution Solution: From the statements, we have:P and Q (Q or R)If P then SNot SIf R then ANot ASince 'if P then S' and 'not S', we conclude 'not P'.From 'P and Q (Q or R)', if 'not P', then 'Q or R' must be true.Since 'if R then A' and 'not A', we conclude 'not R'.Therefore, R must be false.
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