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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To select k items from n different varieties, there are $\displaystyle {{k+n-1} \choose k}$ ways to do that.
wow thanks i have never heard of that formula but it certainly works
Originally Posted by cubs3205 wow thanks i have never heard of that formula but it certainly works Here is the way it works.
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