小文的口袋中有三张卡片,分别写着1、1、2,小英的口袋中也有三张

小文的口袋中有三张卡片,分别写着112,小英的口袋中也有三张卡片,分别写着122,小文分别从这两个口袋中随机各摸出一张卡片,请你用画树状图或列表的方法求两张卡片的和为偶数的概率是多少?

答案

 


每个结果发生的可能性都相同,其中两张卡片的和为偶数的结果有4.

P(摸出的两张卡片的和为偶数)=

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