This question adds a new rule. When that happens, you should combine it with the existing rules. Here were our original ordering rules:
This question places Y directly after K. So in the first diagram, change K to KY. And then place Z before KY:
I actually drew this diagram beside question 21 when doing this game timed. If you practice drawing this kind of diagram, it takes very little time. Perhaps 10 seconds. And it makes the question much faster to solve.
Now you can use the diagram to eliminate answers. Answers A–D all contradict the diagram.
E is CORRECT. It’s possible for Z to go second if W is first.
Note: Just for fun, you could draw this diagram onto the sequence of six slots; the new rule has made things quite restrictive. From the setup, only L or K can go fifth, and now K can’t go fifth because Y and T are after K (making K fourth at latest).
So we must place L fifth, and we get this diagram:
You definitely do not need to draw that to solve this question. Though it’s not an error to draw it. In some situations a diagram like that would speed you up. But it doesn’t add anything on this question.
(Though actually, drawing this diagram let me instantly solve question 22. It’s rarely useless to draw correct diagrams to help solve a question)
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