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From (5) red, (6) blue, and (7) green balls, how many ways are there to choose (1) red, (2) blue, and (1) green ball?

Answer and explanation

Correct answer: (525)

The choices for different colours are independent, so count each colour selection separately and multiply the results. From 5 red balls, one can be selected in \binom{5}{1}=5 ways. From 6 blue balls, two can be selected in \binom{6}{2}=15 ways. From 7 green balls, one can be selected in \binom{7}{1}=7 ways.

By the multiplication principle, the total is \binom{5}{1}\binom{6}{2}\binom{7}{1}=5\cdot15\cdot7=525. Therefore option C is correct. We do not multiply by an ordering factor because the balls are being selected, not arranged. The colour requirements are fixed, so each valid choice is counted exactly once.

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CombinationsClass11Medium

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