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Unformatted text preview: marbles, without replacement . What is the probability that we select 3 red marbles? P(Three Red )= # of ways for 3 Reds total # of ways to pick 3 P(Two Red and one Black) = Recall: The complement of an event A includes all events that are not part of the event A. Denoted A ′ (or sometimes c A ) P( c A ) = 1 P(A) P(A) = 1 P( c A ) Returning to the marble example: 4 Red, 7 Black Marbles We are selecting 3 marbles. What is the probabilility that at least one will be red? At least one={1red, 2red, 3red} P(At least one Red) = P(1 red) + P(2 red) + P(3 red) This is a lot of calculation. Using the complement rule, we get P(At least one Red) = 1 – P(no Red )...
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This note was uploaded on 02/15/2009 for the course STAT 2004 taught by Professor Melutz during the Fall '07 term at Virginia Tech.
 Fall '07
 MELutz
 Statistics, Counting

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