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[Post New]6 Jun 2007 19:05:41 IST
    Subject: Contest [swordfish #3]: Find ways to distribute identical balls in identical boxes
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nunoxic (1469)

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We Have 30 balls and we have 3 boxes,
now,
ways in which no box is empty
= total ways - ways in which either is empty
= total ways - 3 (any one box is empty)
= 30C3 - 3 (30C2)
= 4060 - 1305
= 2755
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