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15 February, 12:21

When I run up a staircase, my stride can carry me up 1, 2, or 3 steps at a time. In how many ways can I run up a 9-step staircase (given that my last stride lands me on the 9th step) ?

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  1. 15 February, 13:08
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    1+1+1+1+1+1+1+1+1

    3+3+3

    2+1+2+1+2+1

    2+1+3+1+2
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