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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.

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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...
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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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