Chapter 1, Level 1 Self-Quiz: F

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. Choose which argument form correctly models the given argument, and which substitutions create a counterexample that shows the argument is invalid.

All computers are electronic devices. All things that require an AC adapter are electronic devices. Therefore, all computers are things that require an AC adapter.

All C are E. All E are A. So, all C are A. Let C= cats, E = mammals, and A = dogs correct incorrect

All C are E. All A are E. So, all C are A. Let C= cats, E = mammals, and A = dogs correct incorrect

All E are C. All A are E. So, all C are A. Let C= cats, E = mammals, and A = felines correct incorrect

All C are E. All A are E. So, all C are A. Let C= cats, E = mammals, and A = felines correct incorrect

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. Choose which argument form correctly models the given argument, and which substitutions create a counterexample that shows the argument is invalid.

No unicorns are immortal creatures. No centaurs are immortal creatures. It follows that no unicorns are centaurs.

No I are U. No C are I. So, no U are C. Let U = cats, I = snakes, and C = mammals correct incorrect

No U are I. No C are I. So, no U are C. Let U = umbrellas, I = icebergs, and C = cats correct incorrect

No U are I. No I are C. So, no U are C. Let U = cats, I = snakes, and C = mammals correct incorrect

No U are I. No C are I. So, no U are C. Let U = cats, I = snakes, and C = mammals correct incorrect

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. Choose which argument form correctly models the given argument, and which substitutions create a counterexample that shows the argument is invalid.

Fidelix was born before 1990. Gil was born before 1991. Thus, Fidelix was born before Gil.

Fidelix was born in 1967. Gil was born in 1977. Thus, Fidelix was born before Gil. correct incorrect

Fidelix was born in 1972. Gil was born in 1988. Thus, Fidelix was born before Gil. correct incorrect

Fidelix was born in 1981. Gil was born in 1980. Thus, Fidelix was born before Gil. correct incorrect

Fidelix was born in 1989. Gil was born in 1990. Thus, Fidelix was born before Gil. correct incorrect

* not completed

. Choose which argument form correctly models the given argument, and which substitutions create a counterexample that shows the argument is invalid.

All strawberries are fruit. All strawberries are plants. It follows that all fruit are plants.

All S are F. All S are P. So, all F are P. Let S = puppies, F = mammals, and P = dogs correct incorrect

All S are F. All S are P. So, all F are P. Let S = puppies, F = dogs, and P = mammals correct incorrect

All F are S. All S are P. So, all F are P. Let S = puppies, F = mammals, and P = dogs correct incorrect

All S are F. All P are F. So, all S are P. Let S = puppies, F = mammals, and P = dogs correct incorrect