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From (7) red, (8) blue, and (9) green balls, how many ways are there to choose (2) red, (2) blue, and (1) green ball?

Answer and explanation

Correct answer: (5292)

A complete selection requires two red balls, two blue balls, and one green ball. The choices within each color are unordered, so each part is counted with a combination. Because the color groups are separate, the number of complete selections is the product of the three independent counts. This is the standard use of combinations together with the multiplication principle.

The red choices are \(\binom{7}{2}=21\), the blue choices are \(\binom{8}{2}=28\), and the green choices are \(\binom{9}{1}=9\). Therefore the total number is \(21\times28\times9=5292\). Thus option C is correct. The factors should be multiplied rather than added, since every red choice can be paired with every blue and green choice.

Related tags

CombinationsClass11Hard

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