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An urn contains N(=N(1) + N(2)) balls of...

An urn contains N`(=N_(1) + N_(2))` balls of which `N_(1)` are white and `N_(2)` red. If n balls are drawn at random, find the probability that among these exactly m balls are white.

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The correct Answer is:
`P(A) = (""^(N_(1))C_(m)xx^(N_(2))C_(n-m))/(""^(N)C_(n))`
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CHHAYA PUBLICATION-PROBABILITY-SAMPLE QUESTIONS FOR COMPETITIVE EXAMS
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