LSAT 30, Logical Reasoning I, Q18

QUESTION TYPE: Must be True

FACTS:
Inspired musical performance ➞ good show ➞ sophisticated listeners in the audience ➞ understand your musical roots. 

CONTRAPOSITIVE:
If nobody in the audience understands their musical roots ➞ then there are no sophisticated listeners in the audience ➞ no good show ➞ no inspired musical performances. 

ANALYSIS: This is a question where drawing really helps. For a “formal logic” must be true question, the answer will either come from the original sufficient-necessary diagram chain or its contrapositive. So you really need to be clear on those to be able to answer it. 

It’s quite possible to do it mentally. But if you have any trouble on these questions then make drawings until you get used to the logic. 

___________

1. CORRECT. This is shown by the contrapositive. 
2. This is an incorrect negation.
3. This is an incorrect reversal.
4. We only know that there will definitely be a good show if there is an inspired musical performance. Even if there are sophisticated listeners there might be no inspired performance or good show.
5. This is an incorrect reversal. 

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