一共有52 张牌，有黑桃、梅花、红桃和方片四组，每组13 张，分别是：

2,3,4,5,6,7,8,9,10，J,Q,K,A。同时每张牌的价值是：2 到10 的价值就是其牌面的数字

（如5的值是5）；J、Q和K的价值都是10；A的价值可以是1或者11，每局比赛玩家

均可重新根据需要选取二者之一的价值。游戏规则很简单，玩家手上只有两张牌，如果其

价值相加刚好等于n则胜利，否则失败。现在，你的手上已经有一张牌了，他是黑桃Q，

聪明的你能算出有几种可能在你得到第二张牌后，二者的价值相加刚好是n？-A total of 52 cards, spades, plum, hearts and square piece of four groups (n = 13), respectively: 2, 3, 4, 5, 6, 7, J, Q, K, A. The same time, the value of each card is: the value of 2-10 is the figures of the card surface (such as a value of 5 is 5)　J, Q and the value of K are 10　the value of A is either 1 or 11, each Bureau select either the value of the game players can re-needed. The rules of the game is very simple, players have only two cards, if the value of sum is exactly equal to n is victory or failure. Now, your hands have a card, he is spades Q smart, you can calculate several possible you get a second card, the value of the two sum exactly n?