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

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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 – 5k
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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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