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If the d.c.'s (l, m, n) of two lines are...

If the d.c.'s (l, m, n) of two lines are connected by the relations `l+m+n=0 " and " 2mn+3ln-5lm=0` then the angle between the lines is

A

`pi/2`

B

`pi/6`

C

`pi/3`

D

None

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The correct Answer is:
A
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