(If there are comments below, they most likely contain spoilers.) Here is a rule. You have to know which cards you have to flip to see if the rule is broken or not broken. The rule: If a card has a vowel on one side, it must have an even number on the other side. There are 4 cards. [A] [K] [2] [7] What cards do you need to flip to make sure the rule is obeyed? Think about it for a moment. Spoiler: The Answer The answer is A and 7. (7% of people get this right) First, most people are under a false and illogical belief. You cannot base your answers on denying the antecedent. If you picked A and 2, you are under a fallacy. I never stated that all even numbers must have a vowel on the other side. There are 4 types of judgement: 2 are logical and 2 are illogical. To simplify, let's say that Y is the result of X. The A card would be considered X. You need Y to follow X to obey the rule. Therefore, you need to flip X to know that Y happened. An example of this judgement would be "If it's a pinky, it's a finger." The K card would be considered a false Y. Just because Y is false, does not mean X is false. An example of this false judgement would be "If it's not a pinky, it isn't a finger." The 2 card is tricky, and it is a false X. You can't base the result of Y by knowing the rule for X. An example of this false judgement would be "If it's a finger, it's a pinky." Nowhere did it claim that all even numbers must have a vowel behind it. The 7 card is also tricky, but correct. If Y is flipped over and it breaks the rule of X, it won't work. Because the 7 number is not even, if the card behind it is a vowel, then it breaks the rule. An example of using this would be "If it's not a finger, it's not a pinky." .
Well, I read the comment, but I would've for sure guessed a but I don't know if I would have picked 7.