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 [EAMCET 2003]

If the direction ratios of two lines are given by \[3lm-4\,ln+mn=0\] a

1.	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 [EAMCET 2003]
A.	\[\pi /2\]
B.	\[\pi /3\]
C.	\[\pi /4\]
D.	\[\pi /6\]
Answer» B. \[\pi /3\]

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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 [EAMCET 2003]

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