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From 9 red, 10 blue, and 11 green balls, how many ways are there to choose 2 red, 2 blue, and 2 green balls?

Answer and explanation

Correct answer: 89100

The governing idea is independent combination followed by multiplication. The red balls can be chosen in C(9,2) ways, the blue balls in C(10,2) ways, and the green balls in C(11,2) ways. Since a complete selection requires all three color choices, multiply them: C(9,2)C(10,2)C(11,2) = 36 × 45 × 55 = 89,100. Therefore option D is correct. Adding the three counts would describe a different situation, and using permutations would count ordering that is not part of the selection. The colors are distinct groups, but the balls chosen within each group are not ordered.

Related tags

CombinationsMultistage SelectionBallsPermutations And CombinationsMathematicsClass 11 Mcq

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