I used the deduction from the setup for this one: either the pickup or the limousine has to be last.
I’ll repeat that, it’s extremely important. Either the pickup or the limousine must be last. See the setup section for how to reach that deduction.
Also, the sedan has to be in between the pickup and the limousine. These two facts eliminated three answers.
Remember, the answers are telling us who’s in Tuesday, Wednesday and Friday. Thursday is skipped:
A is wrong because either the pickup or the limousine needs to be last.
C is wrong because the sedan has to be in between the limo and the pickup. But since one of P or L must go last, the pickup. That means the sedan is not in the middle:
E is wrong because the limousine and the pickup would be beside each other. Either the limousine or the pickup must go last. Since this question place the limousine Friday, then the pickup would go saturday. There’s no space for the sedan to go between them:
Note that I eliminated those answers without drawing diagrams. I’m including them only so this explanation is easier to follow.
Now only B and D are left. I did draw diagrams to test these.
This diagram shows that B is CORRECT. It violates no rules:
This diagram shows that D doesn’t work. there’s no space for R to go after V:
The sedan has to go Thursday because the sedan must go between the limousine and the pickup.
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AD says
Hi,
Why we ignore the third rule while eliminating the choice D. Shouldn’t P and S come consecutively? This requires sedan to service on Friday. I would appreciate your response.
FounderGraeme Blake says
There can be multiple reasons to eliminate an answer. I just chose another reason.