September 2007 LSAT Section 2 Question 5

Which one of the following must be true?

Anna on August 3, 2019

Please help

If the correct answer choice is E and no more than 4 valves can be opened after N what is wrong with this sequence K P N H O I G L ? N can be third and more than 4 valves can be opened after.

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Anna on August 3, 2019

Oh , before... Sorry :(

Ravi on August 3, 2019

@annag,

You had this sequence:

K P N H O I G L

This sequence doesn't break any of the rules, so it's fine. It also
satisfies the implicit rule that no more than 4 valves are opened
before N is opened, since only 2 valves are going before N in this
scenario.

Does that make sense? Let us know if you have any other questions!