Buzz Bunny is hopping up and down a set of stairs, one step at a time. In how many ways can Buzz start on the ground, make a sequence of 6 hops, and end up back on the ground? (For example, one sequence of hops is up-up-down-down-up-down.)
A. 4
B. 5
C. 6
D. 8
E. 12

Systematic enumeration中文
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B. 5

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