LSAT PrepTest 20 Section 3 Question 8 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 October 1996 LSAT.

Before we start diagramming, let's think about the consequences of the rules. Let's look for a rule that's affected when P is reduced. The only one we see that is obviously affected is that since P's reduced, L cannot be. Now, look at the last rule, which says two of LMR must be reduced. If L isn't, M and R must be, so B is correct. No need to diagram or look at the other choices.

Remember:

Before you do anything else, just think about the rules quickly. Go from rule to rule and see if you can figure out how they might apply to the situation with which you're presented (in this case, we saw the second-to-last and last rules applied, in that order, in a pretty straightforward way). Now, if you don't see anything after a few seconds, not to worry, diagramming will always work. But if you can find something without diagramming (and do it only if you're sure about it, otherwise diagram), you can save a great deal of time.