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vlada-n [284]
3 years ago
14

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 staircas

e (given that my last stride lands me on the 9th step)?
Mathematics
1 answer:
Romashka [77]3 years ago
6 0
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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