Don't you find it tiring when we express a series with many terms using numerous addition and/or subtraction signs? Don't you wish that we have something to symbolise this action? Well we have a solution, introducing the "Sigma Notation"! In this section, we will learn how to utilise the sigma notation to represent a series, as well as how to evaluate it.

$\sum_{i=1}^n$(an equation containing $i$)

$\sum$ : "Sigma"; summation of $i^{th}$ term to $n^{th}$ term

$i$ : index, a counter for the $i^{th}$ term

$n$ : index of ending term

$\sum$ : "Sigma"; summation of $i^{th}$ term to $n^{th}$ term

$i$ : index, a counter for the $i^{th}$ term

$n$ : index of ending term