The Total solution for NCERT class 6-12
Find the sum to n terms of each of the series in Exercises 1 to 7.
1 × 2 + 2 × 3 + 3 × 4 + 4 × 5 + …
Given series is 1 × 2+ 2 × 3 + 3 × 4 + 4 × 5 + …
It’s seen that,
nth term, an = n ( n +1)
Then, the sum of nterms of the series can be expressed as