MCQ
The direction cosines of a line which is perpendicular to both the lines whose direction ratios are -2, 1, -1 and -3, -4, 1 are ______
- A$\frac{3}{\sqrt{155}}, \frac{5}{\sqrt{155}}, \frac{11}{\sqrt{155}}$
- B$\frac{3}{\sqrt{155}}, \frac{-5}{\sqrt{155}}, \frac{11}{\sqrt{155}}$
- ✓$\frac{-3}{\sqrt{155}}, \frac{5}{\sqrt{155}}, \frac{11}{\sqrt{155}}$
- D$\frac{3}{\sqrt{155}}, \frac{5}{\sqrt{155}}, \frac{-11}{\sqrt{155}}$
