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Math Help - partitions and distributions

  1. #1
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    partitions and distributions

    How many ways are there to pick 10 balls from large piles of identical red, green and blue balls, plus one pink ball, one black ball, and one yellow ball?
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  2. #2
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    Quote Originally Posted by sbankica View Post
    How many ways are there to pick 10 balls from large piles of identical red, green and blue balls, plus one pink ball, one black ball, and one yellow ball?
    Here what you will find in 'back-of-the-book'.
    \sum\limits_{k = 0}^3 {\binom{3}{k}\binom{12-k}{2}}<br />

    Now you reply with reasons.
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