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# probability question

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An urn contains 6 red, 5 blue and 2 green marbles. If 2 marbles are picked at random, what is the probability that both are red?

Mar 2, 2021

there are 13 marbles to choose from the first time, and 12 marbles to choose from the second time, so 156 options in total, and there are 6$\cdot$5=30 ways to choose red each of those times, so 30/156=$\boxed{\frac{5}{26}}$