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Topic: how to derive a formula to find the sum of a sequence?
Replies: 4   Last Post: Nov 3, 2012 3:56 PM

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Ben Brink

Posts: 198
From: Rosenberg, TX
Registered: 11/11/06
RE: how to derive a formula to find the sum of a sequence?
Posted: Nov 2, 2010 7:30 PM
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att1.html (1.2 K)

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!

> 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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