This question places Flynn earlier than Hill. This automatically put us in scenario 1, since scenario 2 has Hill before Flynn:
Scenario 1:
We can conclude two things:
Leung is on Saturday, due to rule 5.
Flynn is first. In scenario 1, H is the only librarian who could go before F. But this question places H after F.
Here’s a diagram of what we know:
Once you make deductions like these, you should check if they solve the question.
D is CORRECT. Moore is earlier than Gomez, and therefore not on Saturday. Therefore, Moore is also earlier than Leung. (Note: only Gomez or Zahn could have gone with Leung on Saturday).
All of the wrong answers involve H, K, M and Z. These librarians are incredibly flexible and can all go before and after one another (except K, who is before Z). So they are highly unlikely to be the basis for must be true answers when used in combination.
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