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.

It would be two ways---upstairs or downstairs.
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? There are many ways to train y How many people are there at the meeting? How many ways of making request are there? There are many ways learn a language.I think using it is the What time is it? There are many ways you can ( ) the time .A What time is it?There are many ways you can ( ) the time (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