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Instructions: Study the given information carefully to answer the questions that follows.
An urn contains 4 green, 5 blue, 2 red and 3 yellow marbles.
Question 80
If four marbles are drawn at random, what is the probability that two are blue and two are red?
Solution
Out of five blue marbles two can be choosen in 5C2 ways
Out of two red marbles two can be choosen in 2C2 ways
So the probability of choosing two blue and two red marbles is = (5C2 x 2C2)/14C4 = $$\frac{10}{1001}$$
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