Handout_5b General instructions for solving probability problems

Handout_5b General instructions for solving probability problems

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GENERAL INSTRUCTIONS FOR SOLVING Feb 12’09 PROBABILITY PROBLEMS For solving a probability problem first of all properly identify and designate all types of the relevant events and the corresponding probabilities given in the condition of the problem, and also the asked for probabilities. This includes the following steps. 1 . Designate the relevant primary events with the convenient capital letters A, B , … (with _ or without subscripts); also designate the complementary events Ā, B, … (with or without subscripts) if necessary. Introduce the corresponding probabilities and set numerical values for those of them which are given explicitly (if any): _ P(A) = ; P(B) = ; P(A i ) = ; P(B i ) = ; P(Ā) = ; P(B) = ; 2. Designate properly the relevant compound events: A∩B
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