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A problem with finding sigma
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Sophia
May 2, 2012, 6:42:45 AM5/2/12
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Hi guys,
I have a simple problem in calculating the the contents of sigma, in following link you see that we separate sigma(n - i), but I don't know why after the separation the answer of sigma(n) is n^2 and it's not like the answer of sigma(i).
http://www.pic1.iran-forum.ir/images/up4/38705171356554647359.jpg
any help would really be appreciated.
Sophia
I have a simple problem in calculating the the contents of sigma, in following link you see that we separate sigma(n - i), but I don't know why after the separation the answer of sigma(n) is n^2 and it's not like the answer of sigma(i).
http://www.pic1.iran-forum.ir/images/up4/38705171356554647359.jpg
any help would really be appreciated.
Sophia
Nicolas Bonneel
May 2, 2012, 1:19:59 PM5/2/12
to
Le 02/05/2012 06:42, Sophia a écrit :
> Hi guys,
>
> I have a simple problem in calculating the the contents
of sigma, in following link you see that we separate sigma(n - i),
but I don't know why after the separation the answer of sigma(n) is
n^2 and it's not like the answer of sigma(i).
>
> http://www.pic1.iran-forum.ir/images/up4/38705171356554647359.jpg
summing n times the constant n necessarily leads to n*n... isn't it ?
> Hi guys,
>
> I have a simple problem in calculating the the contents
of sigma, in following link you see that we separate sigma(n - i),
but I don't know why after the separation the answer of sigma(n) is
n^2 and it's not like the answer of sigma(i).
>
> http://www.pic1.iran-forum.ir/images/up4/38705171356554647359.jpg
summing the variable i which goes from 1 to n leads to the standard
n(n+1)/2 formula
Kaba
May 2, 2012, 1:35:24 PM5/2/12
to
clearly read "= n^2 / 2 - n / 2".
--
http://kaba.hilvi.org
Sophia
May 3, 2012, 2:04:14 AM5/3/12
to
Thanks pals.
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