M119L09to10-page10

M119L09to10-page10 - A and B occur These elos make up the...

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(Lesson 10: Addition Rule; 4-3) 4.10 Example 2 Roll one die. P even Event A or higher than 2 Event B     = # of elos for which A or B occurs N = 5 6 Easiest approach: Begin by indicating the appropriate elos. Here, events A and B are not mees. Both events can happen together, namely if the die comes up a “4” or a “6” on the roll. Warning: Do not double-count the elos (“4” and “6” here) for which both
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Unformatted text preview: A and B occur. These elos make up the intersection of A and B , or simply “ A and B. ” General Addition Rule For any two events A and B , P A or B ( ) = P A ( ) + P B ( ) − P A and B ( ) . Here, P even or higher than 2 ( ) = P even ( ) + P higher than 2 ( ) − P both ( ) = 3 6 + 4 6 − 2 6 = 5 6...
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