Question

Verify: 1 + 2 + 3 + ...
n(n + 1)
taking n = 6 and 15.
+ n =
2​

Answer 1

Step-by-step explanation:

Verify: 1 + 2+3+n(n+1) n=6

1+2+3+6(6+1)

6+36+6

48