Infinite Series

Sequences and Series

Sequence is a succession of numbers formed according to some fixed rule. Example is

1, 8, 27, 64, 125, ...

which is a sequence so that the nth term is given by n3.
 

Series is the indicated sum of a sequence of numbers. Thus,

a1+a2+a3+...+an+...

is the series corresponding to the sequence a1, a2, a3, ..., an, ...
 

Finite and Infinite Series