Question 617401
P(3 yellow) = (4/12)*(3/11)*(2/10) = 24/1320 = 1/55


P(3 blue) = (8/12)*(7/11)*(6/10) = 336/1320 = 14/55


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P(3 Yellow OR 3 Blue) = P(3 yellow) + P(3 blue)


P(3 Yellow OR 3 Blue) = 1/55 + 14/55


P(3 Yellow OR 3 Blue) = 15/55


P(3 Yellow OR 3 Blue) = <font color="red">3/11</font>


Note: we can simply add the probabilities because the two events are mutually exclusive.