Mathematics in Ancient and Medieval India c7.s2.48

c7.s2.48

*Vārasaṁkalita* of 2nd order of n natural numbers \begin{align*} &= 1 + (1+2) + (1+2+3) + \dots n terms \\ &= \Sigma \ (n(n+1))/2 = (n(n+1)\ (n+2))/6 \end{align*}