Find the sum to indicated number of terms in each of the geometric progressions : `sqrt(7),sqrt(21),3sqrt(7) ,`. . . n terms.

Explanation

To find the sum of the first \( n \) terms of the geometric progression (GP) given by \( \sqrt{7}, \sqrt{21}, 3\sqrt{7}, \ldots \), we can follow these steps:

### Step 1: Identify the first term and the common ratio
The first term \( a \) of the GP is:
\[ a = \sqrt{7} \]

...