2. 外语
  3. There are 8 balls in a box, 2 of them are red, 4 of them are white, 2 of them are blue. If 2 balls are to be simultaneously and

There are 8 balls in a box, 2 of them are red, 4 of them are white, 2 of them are blue. If 2 balls are to be simultaneously and

admin2021-10-21  65
问题 There are 8 balls in a box, 2 of them are red, 4 of them are white, 2 of them are blue. If 2 balls are to be simultaneously and randomly selected, what is the probability that they will both be red?
选项 A、1/8
B、1/28
C、1/4
D、3/14
E、1/2
答案B
解析 同时取出两个球共有C82=28种方法，而两个球都为蓝球只有一种取法，所以所求概率为1/28。
转载请注明原文地址:https://www.kaotiyun.com/show/j3tO777K
本试题收录于： GMAT QUANTITATIVE题库GMAT分类
0

GMAT QUANTITATIVE

GMAT

相关试题推荐
随机试题
最新回复(0)