Posted by: GP December 19, 2007
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Learn Venn Diagram: this is a union problem where events are not mutually exclusive, i.e. you have to subtract the stuff ([n-1] times) that is counted multiple (n times) times. I mean count events only once: no duplications.
P(A OR B) = P(A) + P(B) - P (A AND B)
Good Luck, RatoBahley.
Last edited: 19-Dec-07 11:49 AM