The Probability of an Event a or B (Pr(A or B))to

Multiple Choice

The probability of an event A or B (Pr(A or B) ) to occur equals

A) Pr(A) × Pr(B) .
B) Pr(A) + Pr(B) if A and B are mutually exclusive.
C) $\frac { \operatorname { Pr } ( A ) } { \operatorname { Pr } ( B ) }$
D) Pr(A) + Pr(B) even if A and B are not mutually exclusive.