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Ben Brink
Posts:
201
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



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



