题目内容

The relation {(2, 2), (2, 3), (2, 4), (3, 2), (3, 3), (3, 4)} on the set {1, 2, 3, 4}, is irreflexive? ()

A. True
B. False

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The relation {(1, 1), (1, 2), (2, 1), (2, 2), (3, 3), (4, 4)} on the set {1, 2, 3, 4}, is irreflexive? ()

A. True
B. False

The relation {(2, 2), (2, 3), (2, 4), (3, 2), (3, 3), (3, 4)} on the set {1, 2, 3, 4}, is reflexive? ()

A. True
B. False

What rule of inference is used in the argument “If I go swimming, then I will stay in the sun too long. If I stay in the sun too long, then I will sunburn. Therefore, if I go swimming, then I will sunburn.” ( )

A. Modus ponens
B. Modus tollens
C. Hypothetical syllogism
Disjunctive syllogism

What rule of inference is used in the argument “It is either hotter than 100 degrees today or the pollution is dangerous. It is less than 100 degrees outside today. Therefore, the pollution is dangerous.”( )

A. Modus ponens
B. Modus tollens
C. Hypothetical syllogism
Disjunctive syllogism

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