A dfrac (4)(5);B dfrac (4)(5);C dfrac (4)(5);D dfrac (4)(5).

某学生依次进行三门课程的考试,第一门课程考试及格的概率为,以后各门课程考试及格的概率均根据前一门课程考试及格或不及格分别为和.则该学生第三门课程及格的概率为().

A ;

B ;

C ;

D .

参考答案与解析：

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