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Infer number of terms in sum, given the value of the sum
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I agree this problem doesn't sound very simple, so I'll attempt a longer but simpler walk-through solution. Arithmetic series Before we start, we'll need one formula: the sum of all elements in an ...

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In how many ways 3 persons can solve N problems.
Accepted answer
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I don't think any formula will be able to capture those rules, for non trivial values of N and k. What is certainly doable is to write an algorithm to determine that number; or even better, the ...

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