Can someone help me with Evaluating Sums?

Hello,
I am currently working on a practice program in which I need to evaluate finite sums.


Before I get to coding this, I need to understand how to do it on paper...

Can someone please show me how I would go about evaluating this for example:

2n
E i
i=5


Step by step would appreciated b/c I am quite new to this whole concept.

Thanks in advance~!

number_of_terms/2(first_term + last_term)

So the answer to the summation you posted would be (2n - 5)/2(5 + 2n).

IMO, you're going about this backwards. In order to translate math into the form of statements that some language understands, you must first understand the math. Go learn how to find the sum of a finite series, then make your program.