A mouse (or a person) wants to walk from A to B and he must go r

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A mouse (or a person) wants to walk from A to B and he must go right or up (east or north). How many routes are there possible?

答案：56.0

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你好老师，为什么不是，需要8个点才能走到B，每个点两种走法所以2的八次方呢？

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麻烦老师，请问这题该怎么计算呢

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