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# Simplifying sigma notations watch

1. Hi all, I ran into this issue that I barely know how to solve it. Would be great to retrieve help with others. Apology the image below is small.

Simplify the following expressions:

I'm not sure where to begin, if someone can guide me here that would really help me lots. Thank you!
2. (Original post by Mr_Maths_Student)
Hi all, I ran into this issue that I barely know how to solve it. Would be great to retrieve help with others. Apology the image below is small.

Simplify the following expressions:

I'm not sure where to begin, if someone can guide me here that would really help me lots. Thank you!
You should be familiar with the formula for the sum of the first N natural number. Sn= (n/2)(n+1)
You should also know that when you have Σ(2j) it is the same as 2Σj
So the expression reads what is the sum from i=1 to 2n of i - 2(sum from j=1 to n of j)
So just write out the expressions and get rid of the signs notation and then simplify the answer.

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Updated: October 28, 2015
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