Sigma notation  Sequences and Series
Sigma notation
Related concepts:
 Introduction to sequences
 Introduction to infinite series
Lessons
Notes:
$\sum_{i=1}^n$(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

1.
Evaluate the following arithmetic series:

3.
Evaluate the following geometric series:

6.
Evaluate the following infinite geometric series:

7.
Write the following sum in sigma notation, then evaluate