September 2009 LSAT
Section 4
Question 8

September 2009 LSAT
Section 4
Question 8

Reply

Jacob-R on April 3, 2019

Iâ€™m happy to help. Understanding the direction of the condition is absolutely crucial, for this and for many other LR and LG questions. The rule in question states:If no S -> V.

The contrapositive of this rule is:

If no V -> S.

Notice that this is NOT the same thing as saying that if V is IN, then S is OUT. The direction is crucial! Both the rule and the contrapositive only tell us something about the situation in which either S is OUT or V is OUT.

Therefore, in question 2, when we are told that V is in, the rule referenced above does not get activated! And that is because the direction of our conditional statement always starts with either S or V not being in.

Same exact thing for rule 4.

If no R -> L.

Contrapositive:

If no L -> R.

Does that help? Let us know if this concept is not clicking, because it is absolutely crucial!

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