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प्रश्न
Write the number of ways in which 5 red and 4 white balls can be drawn from a bag containing 10 red and 8 white balls.
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उत्तर
4 white and 5 red balls are to be selected from 8 white and 10 red balls.
∴ Required number of ways =\[{}^8 C_4 \times^{10} C_5\]
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