作者Racci (Another Day...)
看板GRE_Verbal
标题[请益]一题来欣作业里面的题目
时间Mon Nov 27 18:10:59 2006
C-6
Bill purchase an item and receives no change. Before the purchase,
he had only a five-dollar bill. How many distinct possibilities are
there for the total amount of his purchase?
a) 3
b) 4
c) 6
d) 9
e) 10
想要请问大家
这问题要怎麽算比较好 排列组合?
我只有烂方法: 一个一个列出来 XD
感激!
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1F：→ heure:我可以说不是一种就是条件不足吗？ 202.178.207.26 11/29 02:14
2F：推 ethan0713:请问答案是多少...140.112.200.127 11/29 10:02