According to the rule of inference called modus tollens the following inference is
validly deducible
a. (p + r) ? s (p + r) ?? s ???
b. (p ? r) ? s (p ? r) ?? s
c. -(p + r) ? s p + r ?? s
d. (p + r) ? s -s ?? - (p + r)
d.
Philosophy & Belief
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a. true b. false
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