This question gives you a new rule. Whenever a question gives you a new rule, you should draw it, and see how it affects the existing rules.
Here, 0 can’t go 3rd, and can’t go 5th. That means 0 must go 4th. C is CORRECT.
There are a few of things to point out.
Focus on restrictions
- Once a variable gets many restrictions, you should consider where it can go. That’s how you get to the “0 must be 4th” deduction.
- You should focus on 0, since it already has restrictions, and this question adds a new one.
Don’t draw, or draw a limited diagram
- You don’t necessarily need to redraw the diagram. At an advanced level, you can just look at your setup and see “oh, this means 0 can’t go 1st, 2nd, 3rd and 5th”
- But, you also don’t need to redraw a full main diagram. This is the diagram I actually drew on my own paper. It’s much faster and conveys the same information:
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