草草面了十几分钟。 Question: We have a kind of card, one side is letter, another side is number. (letter- side, number-side) Now, given 4 cards with one side facing you. X, Y, 1, 2 You have to find out the number-side of the card whose letter-side is X
f*e
5 楼
先翻X,再决定是否翻1,2?这里有什么trick?
letter-
【在 m******g 的大作中提到】 : 草草面了十几分钟。 : Question: : We have a kind of card, one side is letter, another side is number. (letter- : side, number-side) : Now, given 4 cards with one side facing you. : X, Y, 1, 2 : You have to find out the number-side of the card whose letter-side is X