What rule of inference is used in the argument “If it snows today, the university will close. The university is not closed today. Therefore, it did not snow today.” ( )
A. Modus ponens
B. Modus tollens
C. Hypothetical syllogism
Disjunctive syllogism
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What rule of inference is used in the argument “Linda is an excellent swimmer. If Linda is an excellent swimmer, then she can work as a lifeguard. Therefore, Linda can work as a lifeguard.”( )
A. Modus ponens
B. Modus tollens
C. Hypothetical syllogism
Disjunctive syllogism
What rule of inference is used in the argument “Jerry is a mathematics major and a computer science major. Therefore, Jerry is a mathematics major.” ( )
Addition
B. Simplification
Conjunction
D. Resolution
The integers in set {11, 15, 19} are pairwise relatively prime.( )
The integers in set {14, 15, 21} are pairwise relatively prime.( )