这是一个创建于 3334 天前的主题，其中的信息可能已经有所发展或是发生改变。
In the room there are four identical basketballs and two identical footballs.
Now if you want to put them in one line, how many solutions are there?
Tips:please change the form of the number you get.The Programmers
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1
Bryan0Z 2015-11-07 02:36:57 +08:00 via Android
噗，第一部凯撒啊
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2
zzcworld 2015-11-07 10:10:09 +08:00 via iPhone
四个篮球五个空隙 放两个足球 共十种
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