# Question #6a3be

##### 1 Answer

Mar 22, 2015

Here are two methods of solution, one algebraic and one arithmetical.

**Algebraic**

The

so

The sum of the first

Substituting,we get:

Algebra gives us

**Arithmetical**

Work backwards from the

The

The sum

The previous term is

Continue until we get: The terms we need are: