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23-11-2016
Mathematics

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Suppose that a red die and a green die are tossed and the numbers on the sides that face upward are observed. what is the probability that the numbers add up to either 7 or 11?

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nobillionaireNobley nobillionaireNobley

25-11-2016

(red, green) add up to 7 = (1, 6), (2, 5), (3, 4), (4, 3), (5, 2), (6, 1)
(red, green) add up to 11 = (5, 6), (6, 5)

P(add up to either 7 or 11) = 8/36 = 2/9

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