Find the sum to n terms of the series `1.2.3+2.3.4+3.4.5+…`

Find the sum of n terms of the series 1. 2. 3+2. 3. 4+3. 4. 5+

Find the sum of n terms of the series 1. 2. 3+2. 3. 4+3. 4. 5+

Find the nth term and the sum to n terms of the series 1.2+ 2.3 +3.4 + ...

The sum to 100 terms of the series 1.2.3. + 2.3.4. + 3.4.5. + …+ n(n + 1) (n+2) + …. is integral multiple of

The sum to 100 terms of the series 1.2.3. + 2.3.4. + 3.4.5. + …+ n(n + 1) (n+2) + …. is integral multiple of

Find the nth term and the sum of n terms of the series 1.2.4+2.3.5+3.4.6+....

Find the sum of n terms of the series 1. 2^2+2. 3^2+3. 4^2+

Find the sum of n terms of the series 1. 2^2+2. 3^2+3. 4^2+

Find the sum to n terms of the series 1xx2+2xx3+ 3xx4+ 4xx5+......