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A bag has 3 red marbles and 5 blue marbles. If you randomly pull out 4 marbles, what is the probability of getting two red ones and two blue ones? 

 Jun 3, 2020
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There are 1680 possible combinations for pulling out marbles. (8*7*6*5)

There are 6 possible combinations for getting 2 red and 2 blue. (RRBB, RBRB, BRBR, BBRR, BRRB, and RBBR)

\(6\over1680\)\(\Rightarrow\)\(1\over280\)

The answer is \(1\over280\)

 Jun 3, 2020

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