Teaching EMRS PGT Mock Test 2023 Mathematics Three Dimensional Geometry Direction ratios and Direction cosines
If \(\left( {\frac{1}{2},\frac{1}{3},n} \right)\)are the direction cosines of a line, then the value of n is
1
\(\frac{{\sqrt {23} }}{6}\)
2
\(\frac{{23}}{6}\)
3
\(\frac{2}{3}\)
4
\(\frac{3}{2}\)