Question
Prove The Theorem : (Section formula for internal division) Let $\mathrm{A}(\bar{a})$ and $\mathrm{B}(\bar{b})$ be any two points in the space and $\mathrm{R}(\bar{r})$ be a point on the line segment $\mathrm{AB}$ dividing it internally in the ratio $m: n$.
Then $\bar{r}=\frac{m \bar{b}+n \bar{a}}{m+n}$
Then $\bar{r}=\frac{m \bar{b}+n \bar{a}}{m+n}$