A) \[2,\,\,3,\,\,-6\]
B) \[\frac{2}{7},\,\frac{3}{7},\,-\frac{6}{7}\]
C) \[\frac{2}{5},\,\,\frac{3}{5},\,-\frac{6}{5}\]
D) None of these
Correct Answer: B
Solution :
Direction ratios of normal to the plane are (2, 3, ? 6) \[\therefore \] Direction cosines are, \[\left( \frac{2}{\sqrt{49}},\,\frac{3}{\sqrt{49}},\,-\frac{6}{\sqrt{49}} \right)\] or \[\left( \frac{2}{7},\,\frac{3}{7},\,\frac{-6}{7} \right)\].
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