Logic 1.4 Iii

Front 1

Since Tom is the brother of Agatha, and Agatha is the mother of Raquel, it
follows that Tom is the uncle of Raquel.

Back 1

Deductive, Valid argument

Front 2

When a cook cannot recall the ingredients in a recipe, it is appropriate that
she refresh her memory by consulting the recipe book. Similarly, when a student
cannot recall the answers during a final exam, it is appropriate that she
refresh her memory by consulting the textbook.

Back 2

Inductive, Weak argument.

Front 3

The Broadway Theater marquee says that The Phantom of the Opera is playing
nightly. Therefore, it must be that case that Phantom is playing there tonight.

Back 3

Inductive, Strong argument.

Front 4

Since Christmas is always on a Thursday, it follows that the day after Christmas
is always a Friday.

Back 4

Deductive, Valid argument. (Unsound)

Front 5

Suppose figure A is a triangle having two equal angles. It follows that figure A
has two equal sides.

Back 5

Deductive, Valid.

Front 6

By accident Karen baked her brownies two hours longer than she should
have. Therefore, they have probably been ruined.

Back 6

Inductive, strong.

Front 7

After taking LSD, Alice said she saw a flying saucer land in the shopping center
parking lot. Since Alice has a reputation for always telling the truth, we
must conclude that a flying saucer really did land there.

Back 7

Inductive, weak

Front 8

Since Phyllis is the cousin of Denise, and Denise is the cousin of Harriet, it
follows necessarily that Harriet is the cousin of Phyllis.

Back 8

Deductive, Invalid