They had no idea how many red or blackcards the deck contained.
它们无法知道其中红卡和黑卡的具体数量。
2
At first, the players were told how many red CARDS and blackCARDS were in the deck, so that they could calculate the probability of the next card being a certain color.
首先参与者被告知在这堆卡片中红卡和黑卡的数量，这使得它们可以计算出下一张卡片不同颜色的概率。
3
Either way, I always wonder if there is such a huge demand for black market library CARDS that it justifies out level of concern? I hope so?