September 2009 LSAT Section 5 Question 9

Two months ago a major shipment of pythons arrived from Africa, resulting in a great number of inexpensive pythons in...

Martin-DiMarco on April 2, 2022

Why is answer choice D incorrect here?

The stimulus states that ALL pythons that contract the disease die within 6 months. The contrapositive of this is that if a python didn't die within 6 months, then the python did not contract the disease. This logic is reflected in answer choice D. Very shocked to see that I got this wrong. Someone please explain. Logic: If PCD then D6M, not D6M then not PCD.

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Emil-Kunkin on April 15, 2022

Hi Martin,

Your reasoning about the contrapositive is in fact correct. However, this does not mean that the pricing is a result of the disease. Just because it is true that if a python does not die within six months then it did not have the disease does not indicate the reason for the pricing.