If $\frac{1}{2}, \frac{1}{3}, n $ are direction cosines of a line, then the value of n, is
Answer & explanation
Correct answer: option 1
Since $\frac{1}{2}, \frac{1}{3}, n $ are direction cosines of a line.
$∴ \frac{1}{4}+\frac{1}{9}+n^2=1 ⇒ n^2 = \frac{23}{36}⇒ n = \frac{\sqrt{23}}{6}$