As with question 14, the fastest way to answer this is to draw quick sketches. They shouldn’t take long. If you know the rules, you should be able to draw each scenario in 5-10 seconds.
If you can’t draw that fast, then practice. Your new diagrams don’t need to be fancy. Here’s how I drew A, for example:
P ___ ___ O ___
(first step, 3 seconds. I just did what the rule said)
P ___ ____ O-P
(second step, 1 second. I added in rule 5)
(third step, 2 seconds I added in SS)
My actual sketches are less detailed than what I draw in this book. On these diagrams I include all the details so they’re easier to follow.
On the local diagrams I’ve circled the letters mentioned in the answer choice.
A doesn’t work, because we don’t have two variables that go consecutively.
B is CORRECT.
C doesn’t work. We have to put the two S’s in the middle, and only Monday is open. But O can’t go on Monday.
D doesn’t work. There are two spaces open in the middle. We can’t make them both P, because P can’t go on Wednesday.
We can’t make them both O, because of rule 5. If O goes on Thursday, then P has to go on Friday.
E doesn’t work. There are two possibilities. If S goes on Thursday, then there’s no space for anyone else to go twice.
O can’t go on Monday, so P goes there. If we put P on Tuesday too, then O has nowhere to go.
If S is inspected on Tuesday and Wednesday, then we run into the same problem. If we put P on Thursday, then O has nowhere to go.
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