If Lapas and Kelly each occupy a window seat, then which one of the following could be true?

yuliyavi October 29, 2019

Set up question

Why for rule 2, the explanation for contrapositive says if HL is not together then M sits at window seat. Why does it have to be window? Why not-M (aisle) implies M (window)? Why can't M be anywhere else? Thanks!

Replies

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SamA October 30, 2019

Hello @yuliyavi,

Pay attention to this part of the premise: "Each row has exactly two seats: a window seat and an aisle seat." There are only two types of seats, window and aisle.

Therefore, we can say if not window, then aisle. not W - - - - - - > A
We can also say if not aisle, then window. not A - - - - - -> W

Rule 2: M(aisle) - - - - - - - > HL
Contrapositive: not HL - - - - - - - > M(window)

Sunny March 16, 2021

Hi, if one were to under time pressure accidentally overlook the previous hypothetical from Question #14, and create a quick one corresponding to Question #15, answer A and answer B are both coming out to be 'could be true'. Kindly explain what I'm missing here. Thanks so much!