(i) \ \

Step 1: \ \

The series \ \

An arithmetic series is a series of numbers such that the difference of any two successive members of the sequence is a constant.

The series is arithmetic series.

Common difference \ \

\ \

Formula for the term in arithmetic series . \ \

Where first term. \ \

Substitute the values in term. \ \

\ \

. \ \

Step 2: \ \

For \ \

\ \

\ \

Solution: \ \

term . \ \

(iii)

Step 1:

The series

A geometric series is a series with a constant ratio between successive terms.

The series is geometric series.

Formula for the term in geometric series .

Where first term.

Step 2:

For

Solution:

term .

\ \