Question: For the question below, I tried to solve it by calculating (7c3 (3blue) + 5c1(1red))/12c4(entire). Can you explain what I did wrong in this case?

For the question below, I tried to solve it by calculating (7c3 (3blue) + 5c1(1red))/12c4(entire). Can you explain what I did wrong in this case?

An urn contains 12 balls, 5 of the balls are red and the other 7 are blue.If we randomly draw 4 balls from the urn without replacement, what is the probability that exactly 3 of them are blue?Give your answer to 3 decimal places.

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