# What is the sum of the geometric sequence -1, 6, -36, ... if there are 7 terms?

##### 2 Answers

Sep 2, 2015

#### Answer:

#### Explanation:

In this sequence we have:

Aug 20, 2016

#### Answer:

#### Explanation:

In the given GP, we have the following:

We can find

There are 2 formulae for