Math probability - HELP

A bag contains 3 red, 5 yellow, 2 green and 6 blue marbles. If one marble is chosen at random, replaced, and then a second marble is chosen at random, find the probability of obtaining 2 marbles of different colors.

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asked by Bryan
  1. prob of two reds = 3/16*3/16 = 9/256
    prob of two yell = 5/16*5/16 = 25/256
    prob of two green= 2/16*2/16 = 4/256
    prob of two blue = 6/16*6/16 = 36/256
    so chance we WILL get two of something
    = 74/256
    so chance we WILL NOT get two the same
    = 1- 74/256 = 182/256 = 0.711

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    posted by Damon

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