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本帖最后由 roseF 于 2013-1-26 16:56 编辑
请教各位下面题的解题思路
we had to design a colour code for all the books in our class library. we decided to have 5 stripes on each book, we could colour each stripe in one of the three colours. it didn't matter if more than one stripe have the same colour, not even if they were adjacent. but we could not have all the stripes the same colour. how many different books could we code in this way?
like this
多谢啦
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