A high IQ individual would probably guess that the right answer is "undecidable" BUT he/she would still chooses 32 because of his/her understanding of the context of an IQ test. The goal is to recognize the most "anticipated" pattern, not the existing one.
Yeah. On an ordinary IQ test I'd answer 32 in a heartbeat. In reality, uh, it sorta depends.
Problem is a lot of people who think 32 is the only possible answer are considered "high IQ" in a testing environment.
Best standard IQ test item I ever saw was a pattern matching question that required you to engage in a bit of lateral thinking & break the previous answering scheme.
But that was an outlier in a test battery that mostly consisted of more-difficult linear thinking & nothing else.