June 2019 LSAT Section 4 Question 11

Which one of the following could be the schedule of the paintings shown in the four weeks, listed in order from the f...

Abigail-Okereke on February 24, 2022

Rule 4

Hi, I wrote rule 4 as... H(before 3) --> I (1). The parentheses represent a subscript by the way. I saw in the real time video Matt wrote it differently. Can someone confirm if my conditional is correct?

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Emil-Kunkin on March 3, 2022

Hi Abigail,

We could diagram the original statement as
If I/= Week 1 -> H/= Earlier than 3

And the contrapositive as
If H= Earlier than 3 -> I=1

Your notation was right, I think you might have gone to the contrapositive before the actual rule itself. Theres absolutely nothing wrong with that (in fact, for "unless" conditions I tend to do the same thing) but make sure to always take the contrapositives!