LG Game 2 Question 9 Explanation
This is a common question type on in-out games. It asks which two people can’t go together.
You’re looking for the following relationship:
- The variable on the left is in positive form. i.e. “S”
- The variable on the right is in negative form i.e. “M”
- Example: S ➞ M, M ➞ S
In other words, one variable being in forces the second variable out. This method works whether you look at the main diagram or the contrapositive. Pick a pair of variables from an answer and look for the left most variable on either of the diagrams. Then see if it matches the form I described above.
A is wrong. There are no arrows connecting M and T.
B is wrong. There are no arrows connecting O and Y.
C is wrong. Z has no rules, it can never force another variable out.
D is CORRECT. If S is in, W is out:
(T is in too of course. I’ve only circled the variables leading from S to W in order to clarify the relationship you’re looking for on this question.)
E is wrong. If W is in, Y is in. Clearly, those two can be together.
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