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3 February, 15:22

A bag contains 10

marbles:

are 3 green,

are 5 red, and

are 2 blue. Hans chooses a marble at random, and without putting it back, chooses another one at random. What is the probability that both marbles he chooses are red? Write your answer as a fraction in simplest form.

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  1. 3 February, 17:05
    0
    The answer is (5/10) * (4/9) = 20/90 = 2/9

    because there are 5 red marbles out of a total of ten. if you take one out then there are 4 red marbles out of a total of 9. The probability of these events being in succession is the product of their probabilities.

    any questions?
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