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What is the converse of some students are cheaters?

• All students are cheaters.

• Some students are not non-cheaters.

• Some cheaters are students.

• Some non-students are non-cheaters.

What is the obverse of "All tuna are fish"?

• All non-fish are non-tuna.

• No tuna is a non-fish.

• All fish are tuna.

• No non-fish are tuna.

What is the contrapositive of "Some watches are not expensive"?

• No watches are expensive.

• Some non-watches are expensive.

• Some non-watches are non-expensive things.

• Some non-expensive things are not non-watches.

Are the following propositions equivalent?

All S are P.

All non-P are non-S.

• Yes

• No