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For a person who can climb stairs either one, two, or three stairs at a time there are many ways of climbing a stairway with ... stairs. For a stairway consisting of four stairs, there are the following seven ways: {{1,1,1,1}, {1,1,2}, {1,2,1}, {2,1,1}, {2,2}, {1,3}, {3,1}}. This Demonstration shows the combinations and counts the permutations of these combinations for stairways of different lengths. It also shows a simpler way of finding the number of different ways of climbing the stairways using the Tribonacci series.

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      EUN,LOM,LRE4,work-cmr-id:398046,http://demonstrations.wolfram.com:http://demonstrations.wolfram.com/WaysOfSteppingOneTwoOrThreeStairsUpAStairway/,ilox,learning resource exchange,LRE metadata application profile,LRE

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