所有斑马都是有条纹的动物,但这是否意味着所有有条纹的动物都是斑马?当然不是。你会上类似逻辑错误的当吗?试试这个。有人从一副纸牌中发出四张,每张牌都是一面图形另一面花纹。于是,这人说:桌上任何一张一面是三角形的牌,另一面总是条纹。“如果你想肯定他的话是真的,你需要翻转哪些牌? All zebras are streaked animals, but does that mean that all streaked animals are zebras? Certainly not. Would you be going to a logic-like mistake? Try this. Someone from a deck of cards issued four, each card is a pattern on the other side of the pattern. So, this man said: ”Any one side of the table is a triangular card, the other side always stripe. "If you want to be sure what he says is true, which cards do you need to flip?