June 2010 LSAT
Section 5
Question 14

June 2010 LSAT
Section 5
Question 14

Replies

Nic_geraci on September 15, 2019

Not X —> ABECAUSE... If Z doesn’t exist then you must use the contrapositive of X—->Z which is Not Z —> Not X so to complete the problem it MUST be Not X—> A

That reads as Not Z—> Not X—> A

Irina on September 21, 2019

@shazia khan,The question requires us to find a missing premise. We are given the following premises:

(1) X -> Z

(2) ~Z

(3) ?

(4) Therefore, A

We can take a contrapositive of (1):

(4) ~Z -> ~X

Then from (2) and (4), we can infer:

~X

Now, the only remaining step is to get from ~X to our conclusion A, the missing premise thus must be ~X -> A

If we put all the resulting premises together:

~Z

~Z -> ~X

~X ->A

We can conclude that:

A

Let me know if you have any further questions.

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