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# Maths question help!!!

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1. What would the common difference be in a series represented like this:
and how would I calculate this?
5
Σ r(r+1)
r=0
2. (Original post by Purpleunicorn197)
What would the common difference be in a series represented like this:
and how would I calculate this?
5
Σ r(r+1)
r=0
There is no common difference like with a geometric series. But you can split the summation up as follows
.
Using the standard results
and
.
Remember that for the sum you gave we start at r=0, not 1.

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