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OpenStudy (anonymous):
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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OpenStudy (anonymous):
I have asked this question 4 times over the past 2 hours, can someone help please?
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