1. The pair of lines whose direction cosines are given by the equations 3l+m+5n=0, 6mn-2nl+5lm=0 are :
(a) parallel
(b) perpendicular
(c) inclined at cos-1 (1/6)
(d) none of these
Answer : (c)
Explanation : No answer description available for this question. Let us discuss.
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