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There are N steps, how many possible ways are there to climb those steps if you can take either 1 or 2 steps at a time?

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There are N steps, how many possible ways are there to climb those steps if you can take either 1 or 2 steps at a time?
posted Oct 23, 2013 by Atul Mishra

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1+(n-1)!/(n-2)!+(n-2)!/(n-4)!2!+(n-3)!/(n-6)!3!   .....

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