2. 外语
  3. Nine pieces of paper numbered consecutively from 1 to 9 are put into a hat. If one piece of paper is drawn at random from the ha

Nine pieces of paper numbered consecutively from 1 to 9 are put into a hat. If one piece of paper is drawn at random from the ha

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问题 Nine pieces of paper numbered consecutively from 1 to 9 are put into a hat. If one piece of paper is drawn at random from the hat, what is the probability that it will have an even number?
选项 A、1/9
B、2/9
C、4/9
D、1/2
E、5/9
答案C
解析 把标号为1至9的9片纸放入一个帽子中，若从帽子中随机地抽出1片纸，它是偶数的概率为多少?
解：本题的正确答案是(C)。1至9中偶数有2、4、6和8共四个，那么随机抽出1张纸其标号为偶数的概率为4/9。
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