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Find the number of ways of selecting 9 balls from 6 red balls, 5 white balls and 5 blue balls if each selection consists of 3 balls of each colour.
There are a total of 6 red balls, 5 white balls, and 5 blue balls.
9 balls have to be selected in such a way that each selection consists of 3 balls of each colour.
Here,
3 balls can be selected from 6 red balls in ways.
3 balls can be selected from 5 white balls in ways.
3 balls can be selected from 5 blue balls in ways.
Thus, by multiplication principle, required number of ways of selecting 9 balls
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