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tauta_krypta · 3414 days ago · link · · parent · post: A Three-Question Quiz To Test Your Rationality
There's no point flipping J over, because the rule doesn't say anything about cards which don't have a vowel on the letter side. There's no point flipping 2 over, because if it isn't a vowel then the rule doesn't specify anything, and if it is a vowel, then the number is even anyway, so the rule still holds. On the other hand, if 9 has a vowel on the opposite side, the rule is incorrect, so you have to flip it over to check. Likewise, if U has an odd number on the opposite side, the rule is also incorrect, so you have to flip it over too.