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p and c

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6 white balls and 6 black balls are to be distributed among 10 urns so that there is atleast one ball in each urn what are the number of the different distributions of the ball
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10 balls can go in 10 urn in factorial(10) ways and now we are left with 2 balls so 1st ball can go in any of the 10 bag in 10 ways and 2nd ball can go in any of remaining 9 bags in 9 ways

so, Total ways = fact(10) *90
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