Question:
A line is perpendicular to two lines having direction ratios $1,-2,-2$ and $0,2,1$. The direction cosines of the line are
A. $\frac{-2}{3}, \frac{1}{3}, \frac{2}{3}$
B. $\frac{2}{3}, \frac{1}{3}, \frac{-1}{3}$
C. $\frac{2}{3}, \frac{-1}{3}, \frac{2}{3}$
D. none of these
Solution:
