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Let A and B be events in a sample space, and suppose

$\begin{displaymath} P(A) \; = \; .4, \quad P(B) \; = \; .5 .\end{displaymath}$

Calculate $P(A \cup B)$ if

(a) A and B are independent.

(b) A and B are mutually exclusive.

Dennis Cox
3/8/2001