# A sum of numbers

Posted 4 months ago
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 Hello all, I really appreciate "WolframAlpha", but I don't understand how "WolframAlpha" calculates the next amount: Thank you very much!All the best!
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Posted 3 months ago
Posted 3 months ago
 I would guess W|A is doing summation like Riemann integration. So sum from upper to lower = -sum from lower to upper.
Posted 3 months ago
 Isn't W|A input the same as cntl+= in the desktop version? That's what I've done above.
Posted 3 months ago
 Hello all, What do you think about the values given by "Wolfram Alpha" in the cases: 1) sum_{k=n}^1 k = -9 for n=5 ? 2) sum_{k=5}^1 k =0 ? Thank you very much!Iulian
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