What will be the cross product of the vectors 2i + 3j + k and 6i + 9j + 3k?(a) i + 2j + k(b) i – j – 5k(c) 0(d) 2i – j – 5kThis question was posed to me in a national level competition.My doubt stems from Computational Geometry in section Computational Geometry of Data Structures & Algorithms II

What will be the cross product of the vectors 2i + 3j + k and 6i + 9j

1.	What will be the cross product of the vectors 2i + 3j + k and 6i + 9j + 3k?(a) i + 2j + k(b) i – j – 5k(c) 0(d) 2i – j – 5kThis question was posed to me in a national level competition.My doubt stems from Computational Geometry in section Computational Geometry of Data Structures & Algorithms II
Answer» RIGHT ANSWER is (c) 0 Easy EXPLANATION - The GIVEN vectors are parallel to each other. The cross PRODUCT of parallel vectors is 0 because sin(0) is 0.

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