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Partition (number theory)

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Sum of subsets with k elements having a total sum of r

This question is a mirror of the question Sum of subsets which I found interesting. The problem is like this:

Let , how many subsets with k elements that are having the sum of value r?

For instance, if n = 6, k = 3, r = 10:

The following sets: ...

sciencolic 19 Aug 10 |1 answer
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sciencolic

I love Physics, Mathematics and Science.
Japan