There are N steps.ur at the No.Y step.How many ways would it
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There are N steps.ur at the No.Y step.How many ways would it be if u walk K steps?one step once.
There are N steps.ur at the No.Y step.How many ways would it be if u walk K steps?one step one time.Who's smart enough to help me solve this problem?Help please.
There are N steps.ur at the No.Y step.How many ways would it be if u walk K steps?one step one time.Who's smart enough to help me solve this problem?Help please.
It would be two ways---upstairs or downstairs.
两种情况:上楼、下楼.
两种情况:上楼、下楼.
There are N steps.ur at the No.Y step.How many ways would it
it doesn't matter how many steps there are in them 是什么意思 急需!
HOW MANY STEPS ARE THERE UP TO THIS CLASSROOM?
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(i know it) there are many ways.这首是什么歌?
how many students are there in your school how many is the n
How many people are there in the library?的答语nobody,no one,no