3-d

Question: If the direction ratios of two lines are given by $3lm-4\,ln+mn=0$ and $l+2m+3n=0$, then the angle between the lines is

1) $\pi /2$

2) $\pi /3$

3) $\pi /4$

4) $\pi /6$

Solution:

Explanation: No Explanation

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