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From (6) red, (7) blue, and (8) green balls, how many ways are there to choose (1) red, (2) blue, and (2) green balls?

Answer and explanation

Correct answer: (3528)

The balls are separated into three colors, and the required number must be chosen independently from each color. Since the balls are being selected, not arranged, order does not matter within any color. Thus combinations are used. The choices made from the red, blue, and green groups are independent, so the multiplication principle tells us to multiply the three combination counts.

Choose one red ball in \(\binom{6}{1}=6\) ways, two blue balls in \(\binom{7}{2}=21\) ways, and two green balls in \(\binom{8}{2}=28\) ways. Therefore the total is \(6\times21\times28=3528\). Hence option B is correct. Adding the counts would be wrong because one complete selection includes choices from all three colors simultaneously.

Related tags

CombinationsClass11Medium

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