Study the given information carefully and answer the questions that follow:
An urn contains 6 red, 4 blue, 2 green, 3 yellow marbles.
If two marbles are picked at random what is the probability that either both are green or both are yellow ?
Number of ways of selecting 2 green marbles or 2 yellow marbles = $$^2C_2+^3C_2$$ = 1+3 = 4
Probability = $$4/^{15}C_2$$ = 4/155
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