71、根据历年气象统计资料,某地四月份吹东风的概率为9/30,下雨的概率为11/30,既吹东风又下雨的概率为8/30.则在吹东风的条件下下雨的概率为( )
(1.0)

A. 　 {(a, e)}是割边

B. 　 {(a, e)}是边割集

C. 　 {(a, e) ,(b, c)}是边割集

D. 　 {(d, e)}是边割集

A. 　 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/cbfa63facc47534b5791c0edb3985858.png" ＼* MERGEFORMATINET

B. 　 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/f00401a0806543e0c700b626719028d3.png" ＼* MERGEFORMATINET

C. 　 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/b68a546fa6a2abd42fdf096156b763f0.png" ＼* MERGEFORMATINET

D. 　 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/d7b17fc70b316cb4a0d33d9111f5a0fe.png" ＼* MERGEFORMATINET

A. 　 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/8d20d56c6127cc96b7e82bf3b108e066.png" ＼* MERGEFORMATINET

B. 　 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/45716c0b86036041d966258ffc59f340.png" ＼* MERGEFORMATINET

C. 　 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/d44ccd518c7d8ce91bbdece690509d7a.png" ＼* MERGEFORMATINET

D. 　 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/13176250575a997b8b0dfa7183b109eb.png" ＼* MERGEFORMATINET

A. 　 前n个奇数之和

B. 　 前n个偶数之和

C. 　 前n个正整数之和

D. 　 n的阶乘

A. 　 线性方程组AX=b无解

B. 　 线性方程组AX=b有无穷解

C. 　 线性方程组AX=b有唯一解

D. 　 齐次线性方程组AX=0只有零解

A. 　 1

B. 　 2

C. 　 3

D. 　 4

A. 　 转移概率矩阵为P, INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/ac442473ae925a595caa561099f38720.png" ＼* MERGEFORMATINET

B. 　 若 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/c6c825aa831220855e505785daab06ce.png" ＼* MERGEFORMATINET ,则 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/92b22837f266b5578e50fe1899f2228a.png" ＼* MERGEFORMATINET

C. 　 每个转移概率矩阵都有唯一对应的稳态向量,稳态向量就是转移概率矩阵属于特征值为1的特征向量。

D. 　 转移概率矩阵每个元素表示转移的比例,所以每一行元素之和为1

A. 　 “甲种产品滞销,乙种产品畅销”

B. 　 “甲、乙两种产品均畅销”

C. 　 “甲种产品滞销”

D. 　 “甲种产品滞销或乙种产品畅销”