If the lines r=( i+m j+3 k)+ (2 i+3 j+4 k) and r=(4 i+ j)+ (5 i+m j+ k) intersect each other, then m =

MHT CET 2026 Mathematics question

If the lines and intersect each other, then m =

Answer: (C)

Intersecting lines are coplanar: with . Expanding: . The directions and are not parallel, so

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Question ID VK-098536