If the third digit of an acceptable product code is not 0, which one of the following must be true?

Buzzybee1990 on December 4, 2023

Why can't 3 be third?

It seems like 3 could be 3rd if the 3rd number is not zero given that's the only other rule we are given. If the 2nd number is double the first, it could be 1 then 2. Then if the third number was 3 and then fourth was zero the number 4 could be 5th. So, why can't 3 be the third number as well as 0 being the fourth number? What did I miss, because I keep getting these wrong and can never figure out why. It's my biggest weakness in the lsat and often the section with the least explanations in study.

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Emil-Kunkin on December 4, 2023

Read the question carefully! This is asking us what must be true. While I think it could be true that 3 is third, it doesn't have to be. For must be trues, we need an answer choice that always has to be the case.