If the forest continues to disappear at its present pace, the koala will approach extinction.

cassidyv September 8, 2017

Please explain

If the "if" comes before FCD, why is it not seen as the sufficient condition since it is directly after the "if?"

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Mehran September 15, 2017

@cassidyv "if" introduces a sufficient condition so this sentence would be diagrammed as follows:

FCD ==> KAE

But remember, every general principle has a contrapositive that is identical in meaning.

Contrapositives are created by reversing and negating.

So the contrapositive here would be:

not KAE ==> not FCD

(C) is the contrapositive so (C) would be the correct answer.

Hope that helps! Please watch our video lesson on Sufficient & Necessary Conditions for a more in-depth discussion of these concepts.