作者DanceDan (Dan)
看板GMAT
标题[解题]看不懂的考古题
时间Sun Apr 6 16:40:52 2008
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 ten?
a.3
b.4
c.5
d.6
e.7
答案是e~
我看了好多遍都看不懂～
可以请厉害的版友们帮我解题吗？
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 140.112.222.66
1F：推 kelpiejo:0 1 2 3 4 5 6 最多要7次才有办法凑到两个和为10 04/06 16:45
2F：推 Rock21:还是不懂0.0 04/06 17:21