\(\vec{A}=2\vec{a}+\vec{b}\)
\(\vec{B}=\vec{a}-3\vec{b}\)
Formula to be used – The point dividing a line joining points a and b in a ratio m:n internally or externally is given by \(\frac{mb±na}{m+b}\) respectively.
The position vector of the point C dividing the line externally
A is the midpoint of B and C.