bminto2812 bminto2812

19-01-2018
Mathematics

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A box contains 10 purple marbles, 11 green marbles and 7 yellow marbles. if you pick two without looking, what is the probability that one will be green and the other will be yellow

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gustanika gustanika

19-01-2018

Use combination
probability = (11C1 + 7C1)/28C2
probability = (11+7)/378
probability = 18/378
probability = 1/21

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