An urn contains 6 red, 4 blue, 2 green and 3 yellow marbles.
Number of ways of selecting 2 red balls in 2 chances = $$^{6}C_2$$
Probability of 2 red balls in 2 chances = $$\frac{^{6}C_2}{^{15}C_2}$$ = $$\frac{1}{7}$$
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