The condition for two lines having direction cosines l1,m1,n1 and l2, – InterviewSolution

1.	The condition for two lines having direction cosines l1,m1,n1 and l2,m2,n2 being parallel is (a) l1l2 + m1m2 + n1n2 = 0(b) l1/l2 + m1/m2 + n1/n2 = 0(c) l1/l2 = m1/m2 = n1/n2(d) none of these
Answer» Answer is (c) l₁/l₂ = m₁/m₂ = n₁/n₂

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