概率论与数理统计作业(二)答案
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1、设事件,A B 满足：11(|)(|),()33
P B A P B A P A ===,则()P B = . 解 ()1111(|),()()()()3339
P AB P B A P A P AB P A P A ===?== ()112(|)()()()339
P AB P B A P AB P A P A ==?== []()()1()1()()()P AB P A B P A B P A P B P AB ==-=-+-? 1125()1()()()13999
P B P A P A B P A B =-+-=-+-= 2、设()()()221,,532
P A P A B P B A ===,则()P A B = . 解 ()1211(|),()()()()2525
P AB P B A P A P AB P A P A ===?== ()23()3(|)()()3210
P AB P AB P A B P B P B ==?== 2311()()()()51 ...