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#1 2006-12-05 01:07:04

Toast
Real Member
Registered: 2006-10-08
Posts: 1,321

Summation

We are given the formula


To find the sum of any number from 1 to n. Then this question pops up that wants us to find the sum of the integers from 51 to 120. Can this formula be manipulated to give a correct solution or is the only way:
?

Just out of curiosity, is this the correct way of applying sigma notation to the problem?

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#2 2006-12-05 01:38:31

Patrick
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Registered: 2006-02-24
Posts: 1,005

Re: Summation

Well, the lower boundary(don't know the correct english term) should be 51 if you want the sum of numbers from 51 to 120.


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#3 2006-12-05 02:03:51

Toast
Real Member
Registered: 2006-10-08
Posts: 1,321

Re: Summation

ah, yep kthx

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#4 2006-12-09 04:32:30

krassi_holmz
Real Member
Registered: 2005-12-02
Posts: 1,905

Re: Summation

You can use the general formula to obtain a formula for intervals:

Last edited by krassi_holmz (2006-12-09 04:34:35)


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