2.4 PROBABILITY Rules of probability 1)If A, B, Cr, are any events they are said to be statistically independent events if: P(ABCD=P(AP(BP(C 2)If events a B C.. are not mutually exclusive, then P(A+B)=P(A)+P(B)P(AB) Conditional probability of A, given B P(|) PCB) (B) Conditional probability of B, given A (B| PCB) 12.4 PROBABILITY Rules of probability: • 1) If A, B, C,...are any events, they are said to be statistically independent events if: P(ABC...)=P(A)P(B)P(C) • 2) If events A, B, C, ... are not mutually exclusive, then P(A+B)=P(A)+P(B)－P(AB) Conditional probability of A, given B Conditional probability of B, given A ( ) ( ) ( | ) P B P AB P A B = ( ) ( ) ( | ) P A P AB P B A =