还没有登录哦!

[Problem Solving]

试题详情

题目:

Each of the integers from 0 to 9, inclusive, is written on a separate slip of blank paper and the ten slips are dropped into a hat. If the slips are then drawn one at a time without replacement, how many must be drawn to ensure that the numbers on two of the slips drawn will have a sum of 10 ?

选项:

A、Three
B、Four
C、Five
D、Six
E、Seven

答案:

E

提问:

May老师,这个真的一点思都没有呀[捂脸]

解答:

点赞0
阅读2163
解答: 徐小梅

提问:

May老师,这个真的一点思都没有呀[捂脸]

解答:

点赞0
阅读2164
解答: 徐小梅老师

提问:

想问问老师7是怎么算出来的呀?这题是要用排列组合计算方法算吗?

解答:

点赞1
阅读2268
解答: ken@boost.org.cn老师

问个问题

点我领取
免费专项课程
在线咨询