The Total solution for NCERT class 6-12
1 + (1 + 2) + (1 + 2 + 3) + (1 + 2 + 3 + 4) + … to n terms
Let Tn bethe nth term of the given series.We have:
Tn =n(n+1)/2
= (n2 +n)/2
Now, let Sn bethe sum of n terms of the given series.We have:
∴ The sum of the seriesis [n(n+1)(n+2)]/6