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Question

If a is a vector of magnitude 50 and is collinear with the vector b=6^i8^j152^k and makes an obtuse angle with the positive direction of z - axis, then a is equal to

A
24^i32^j30^k
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B
24^i+32^j+30^k
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C
12^i16^j15^k
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D
12^i43^j15^k
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