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Math Help - seemingly simple, but very complicated to solve combination

  1. #1
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    seemingly simple, but very complicated to solve combination

    Consider a man who wishes to purchase 12 donuts. There are 6 kinds of donuts. How many different combinations of donuts can he purchase?
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  2. #2
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    To select k items from n different varieties, there are {{k+n-1} \choose k} ways to do that.
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  3. #3
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    wow thanks
    i have never heard of that formula but it certainly works
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  4. #4
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    Quote Originally Posted by cubs3205 View Post
    wow thanks
    i have never heard of that formula but it certainly works
    Here is the way it works.
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