问题
解答题
（12分）现有两组卡片，每组3张，牌面数字分别是1、2、3，从中各摸一张。
（1）求摸出2张的牌面数字之和等于4的概率。
（2）摸出2张的牌面数字之和为多少时的概率最大？
答案
，4
18．解：（1）设摸出4的事件为A，则
（2）摸出4的概率最大
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（12分）现有两组卡片，每组3张，牌面数字分别是1、2、3，从中各摸一张。
（1）求摸出2张的牌面数字之和等于4的概率。
（2）摸出2张的牌面数字之和为多少时的概率最大？
，4
18．解：（1）设摸出4的事件为A，则
（2）摸出4的概率最大
Different countries and people have different manners(举止).Here are some examples: If you visit a Chinese family, you should knock at the door first. When the door opens, you should not move before the host says “Come in, please.” Before coming into the house in Japan, it is good manners to take off your shoes. In European(欧洲的) countries, even if your shoes are very dirty, it is not necessary to take them off. In England, a guest(客人) always finishes the drink or the food to show that he enjoys it. This will make the host very pleased. 根据短文内容完成信息表，每空一词。
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