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A red die and a green die have been rolled. What is the probability of the sum is 9
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Assuming the dice are 6 sided: We have a total of 6x6=36 different combinations how many can add to 9? (red, green): {(3.6}, (4,5), (5,4), (6,3)} so 4 combinations sum to 9, or 4/36 = 1/9 therefore the probability is 1 in 9
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