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An urn has contains 5 white and 7 red balls. Draw a ball, note its c.pdf
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An urn has contains 5 white and 7 red balls. Draw a ball, note its c.pdf

  1. An urn has contains 5 white and 7 red balls. Draw a ball, note its color and return it to the urn along with 2 more balls of the same color. Draw a total of 4 balls (as described here). Find probability that A) The first 2 selected are red and the next 2 are white B) Of the 4 balls selected exactly 1 is red? Solution A.) 7/12* 9/14* 5/16* 7/18= 35/768 B.) 1st ball is red: 7/12* 5/14*7/16* 9/18*4= 35/192
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