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Published byClaude York Modified over 9 years ago
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1 Fundamental Counting Principle & Permutations
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Outcome-the result of a single trial Sample Space- set of all possible outcomes in an experiment Event- consists of 1 or more outcomes of a trial Independent event- each of the possibilities does not affect the choices for the others
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Fundamental Counting Principle If event M occurs m ways, and event N occurs n ways, then event m followed by event n occurs m*n ways.
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Example Many answering machines allow owners to call home and get their messages by entering a 3 digit code. How many codes are possible? (The choices of any of the digits doesn’t affect the other 2 digits.- Independent)
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Dependent event- the outcome of 1 event affects the outcome of another event Each player in a board game uses 1 of 6 different pieces. If 4 players play the game, how many diferent ways could players choose pieces?
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Permutation-when a group of objects are arranged in a certain order; order matters n distinct objects taken r at a time
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Example A newspaper has 9 reporters to cover 4 different stories. How many ways can the reporters be assigned to cover stories? n=9 r=4
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Permutation with repition The # of permutations of n objects of which p are alike & q are alike is (alike--repeaters)
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How many different ways can the letters of the word MISSISSIPPI be arranged? n=11(total letters) I=4 S=4 P=2
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Assignment
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