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[size=14.399999618530273px]Pat will walk from Intersection X to Intersection Y along a route that is confined to the square grid of four streets and three avenues shown in the map above. How many routes from X to Y can Pat take that have the minimum possible length?
这提问的最后一句话怎么看得出是让排列组合的啊???完全不懂这个意思啊,我以为它让数有几条路呢??
顺便问下谁有数学单词集合么,看不懂题而错了,感觉好不爽
谢谢!
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