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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
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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}}$

 Mar 3, 2021

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