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JEE MAIN_2019_
10-04-2019-S-1_
Question
Let $A(3,0-1), B(2,10,6)$ and $C(1,2,1)$ be the vertices of a triangle and $M$ be the mid point of $A C$. If G divides BM in the ratio, 2 ; 1 then $\cos (\angle \mathrm{GOA})$ (O being the origin) is equal to:
Select the correct option:
A
$\frac{1}{6 \sqrt{10}}$
B
$\frac{1}{\sqrt{30}}$
C
$\frac{1}{2 \sqrt{15}}$
D
$\frac{1}{\sqrt{15}}$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
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