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Ben Brink
Posts:
180
From:
Rosenberg, TX
Registered:
11/11/06
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RE: how to derive a formula to find the sum of a sequence?
Posted:
Nov 2, 2010 7:30 PM
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Imno,
How many 6's are we adding here? And how many times have we found the sum from k = 1 to k = 5? Does that give you an idea for finding the sum from k = 1 to k = n? Thanks for a great problem!
Ben
> Date: Tue, 2 Nov 2010 19:10:13 -0400
> From: discussions@mathforum.org
> To: discretemath@mathforum.org
> Subject: how to derive a formula to find the sum of a sequence?
>
> So, let's say I have a question like
> 5
> SUM (k+1)
> k=1
>
> 5 being the upper limit
> k being lower limit
> k+1 being the sequence
>
> How would I find a formula to get the answer, without actually adding every k+1 ect
>
> The teacher told us to do something like this for the first step:
> 1 2 3 4 5
> 5 4 3 2 1
> sum of the top and bottom = 6.. From there I'm lost
>
> Can anyone help?
>
> Thanks
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