# The sum of first four terms of a GP is #30# and that of last four terms is #960#. If the first and the last term of the GP is 2 and 512 respectively, find the common ratio.?

##### 1 Answer

Jul 28, 2018

#### Explanation:

Suppose that the **common ratio (cr)** of the **GP in question** is

**term** is the **last term.**

Given that, the **first term** of the **GP** is

Given,

We also know that the **last term** is

Now,

**desired** (real) **cr!**