LSAT PrepTest 42 Section 1 Question 4 Explanation | Logic Games

I didn't write the following blog post. It was already on the blog when I took over the URL. The following blog post may contain mistakes. -Steve

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Here's a Logic Games question from the December 2003 LSAT.

There's no obvious way to solve this based only on the rules, so let's make a diagram. P is the only zoologist. To violate as many choices as we can. let's put K and G together (to try to violate A). We'll add H and L too:

GHKLP

This fits the rules. A is out (since K and G are both selected). E is also out, since we do have two chemists (K and L) and G. We have to alter the diagram to eliminate more choices.

Let's try to violate B and C by putting L and F together, along with G, H, and of course P:

FGHLP

This also fits the rules. B is out since we have L and F together. C is also out, since we have only one chemist, and it's L, not K. So, all that is left is D, and we know D is correct.

Remember:

1) Use a diagram to answer questions unless you can quickly find an obvious answer based on the rules.

2) Violate as many choices as you can with your diagram. If the choice doesn't agree with your correct diagram, it doesn't always have to be true, so it's incorrect. Alter the diagram to eliminate more choices if your initial diagram doesn't eliminate enough of them.