Which of the following statements is equivalent to the statement All philosophers are non-conservatives?

ASome philosophers are not conservatives

BNo philosophers are conservatives ✓ Correct

CSome philosophers are conservatives

DAll non-conservatives are philosophers

Correct answer: (B) No philosophers are conservatives

Explanation

The equivalent proposition is no philosophers are conservatives.

The given proposition is all philosophers are non-conservatives, an A form.

Obversion changes the quality and complements the predicate.

All philosophers are non-conservatives thus obverts to no philosophers are conservatives.

Obversion of the A proposition preserves logical equivalence.

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