Find the sum to n terms of the series :`1xx2xx3 + 2xx3xx4 + 3xx4xx5 + dot dot dot`

Explanation

To find the sum to n terms of the series \(1 \times 2 \times 3 + 2 \times 3 \times 4 + 3 \times 4 \times 5 + \ldots\), we can express the general term and then sum it up.

### Step-by-Step Solution:

1. **Identify the General Term**:
The series can be expressed in terms of \(r\) as follows:
\[
T_r = r \times (r + 1) \times (r + 2)
...