Question: A triangle has a vertex at $(1,2)$ and the mid points of the two sides through it are $(-1,1)$ and $(2,3)$. Then the centroid of this triangle is :
$\left(\frac{1}{3}, 1\right)$
$\left(\frac{1}{3}, 2\right)$
$\left(1, \frac{7}{3}\right)$
$\left(\frac{1}{3}, \frac{5}{3}\right)$
Correct Option: , 2
Solution:
