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28 August, 09:00

A bag contains 10 marbles: 4 are green, 4 are red, and 2 are blue. Heather chooses a marble at random, and without putting it back, chooses another one at random. What is the probability that both marbles she chooses are blue? Write your answer as a fraction in simplest form.

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  1. 28 August, 09:03
    0
    Probability of both marbles blue

    = 2/10 * 1/9

    = 1/45
  2. 28 August, 09:15
    0
    Hence there are 2 blue marbles: P = E/S = 2/10 + 1/9 = 28/90 = 0.3111111
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