Statement -1: The sum of the series  $1+(1+2+4)+(4+6+9)+(9+12+16)+\mathrm{.....}(361+380+400)$ is 8000
Statement - 2:  $\sum _{k-1}^n(k^3-{(k-1)}^3)=n^3,$ for any natural number  $n$.

Statement -1 is true, statement -2 is false

Statement -1 is false, Statement – 2 is true

Statement-1 is true, Statement- 2 is true; Statement -2 is not a correct explanation for Statement -1.

Statement -1 is true, statement -2 is true; Statement- 2 is a correct explanation for statement-1