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Mathematics 9 Online
OpenStudy (anonymous):

a bag contains 8 red, 12 white and 4 blue marbles. If 2 marbles are selected in succession, find the probability as a common fraction in simplest form that both are blue

OpenStudy (anonymous):

probability that the first pick of 24 marbles is blue * probability that the first pick of 23 marbles is blue, but notice that you have 3 blue marbles in the second attempt , not 4.

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