If K is the fourth valve opened, then which one of the following could be true?

on December 29, 2020

Why is it that this one is B and not C?

If it's a "might be true" then couldn't G also be fifth?

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Shunhe on January 5, 2021

Hi @cdrbrooklyn,

Thanks for the question! So put K in fourth and see what happens. Well, we know that we need to fill slots 5-8, and we know that four things must go after K: HOL, and I. So those four all have to go after K. Otherwise, can N be third? Yes, it can. For example:


But can G be fifth? No, it can’t. Remember, we said that the four things after K have to be HOL and I. So that means G has to go before K, and thus before the fourth slot. So that means that G can be at latest third, and so it certainly can’t be fifth.

Hope this helps! Feel free to ask any other questions that you might have.