Find the number of ways of selecting ...

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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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. Assuming that balls of the same colour are distinguishable is (i) 40 (ii) 60 (iii) 180 (iv) 2000

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