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Find the number of ways of selecting 9 b...

Find the number of ways of selecting 9 balls from 6 red balls, 5 white balls and 5 blue balls such that the selection consists of 3 balls of each colour.

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A bag contains 5 black balls, 4 white balls and 3 red balls. If a ball is selected at random the probability that it is either red or black is

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OSWAAL PUBLICATION-SAMPLE PAPER 4-EXERCISE
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