LSAT 21, Logic Game 2, Question 10, LSATHacks

LG Game 2 Question 10 Explanation, by LSATHacks

If there are no green bulbs then we know the third bulb is purple or yellow. That triggers the third rule: the second bulb has to be purple.

We saw in our set up that this means the first bulb has to be yellow or green. If the first bulb were purple, the second bulb would have to be yellow instead of purple.

We’re not using any green bulbs, so the first bulb has to be yellow.

There are only two possibilities. We can either put P or Y in the third spot. B is CORRECT.

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