题目内容

已知变量n为含有6个元素的一维数组，以下哪条语句可将其重塑为3行2列的二维数组，且不改变各元素的数据内容：________

A. n.reshape(3,2)
B. n.reshape(2,3)
C. n.arrange(3,2)
D. n.arrange(2,3)

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有两个numpy数组 X，Y，将 X 放在 Y 的左边的合成方法是：________

A. numpy.vstack(X , Y)
B. numpy.vstack(Y, X)
C. numpy.hstack(X , Y)
D. numpy.hstack(Y, X)

从A到B有三条公路可走，假定节假日车流密集，在某高峰时段，每条路通畅的概率分别为0.7、0.6、0.5，求该时段内：（1）从A到B完全不通的概率；（2）从A到B至少有两条路通畅的概率

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