A) 40
B) 40
C) 20
D) None of these
Correct Answer: A
Solution :
If the given points be A, B, C, then \[\overrightarrow{AB}=k(\overrightarrow{BC})\] \[\Rightarrow -20\mathbf{i}-11\mathbf{j}=k\left[ (a-40)\mathbf{i}-44\mathbf{j} \right]\] On comparing, \[-11=-44k\Rightarrow k=\frac{1}{4}\] And \[-20=\frac{1}{4}(a-40)\Rightarrow a=-40.\]You need to login to perform this action.
You will be redirected in
3 sec