T8 随机事件的假命题计算

• 多尝试合并同类项消去 $P(B)$

$$\begin{array}{c}P(A|B)=P(A)\Rightarrow P(AB)=P(A)P(B)\\ P(A|\bar{B})=\frac{P(A)-P(A)P(B)}{1-P(B)}=P(A)\end{array}$$

(two-types-of-errors-and-rejection-region)=