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[Problem Solving]

试题详情

题目:

A grid of 3 rows and 5 columns has its top right corner labeled Y and its bottom left corner labeled X. An illustration of a compass is on the right denoting west is leftward, east is rightward, north is upward, and south is downward.

In the figure above, X and Y represent locations in a district of a certain city where the streets form a rectangular grid. In traveling only north or east along the streets from X to Y, how many different paths are possible?

选项:

A、720
B、512
C、336
D、256
E、56

答案:

E

提问:

请问老师,这种网格的题目怎么做呢。我记得是找可以分类的那条线,但是具体怎么做不记得了。

解答:

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解答: 徐小梅

提问:

请问老师,这种网格的题目怎么做呢。我记得是找可以分类的那条线,但是具体怎么做不记得了。

解答:

点赞0
阅读1557
解答: 徐小梅老师

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