find a unit vector parallel to the vector 2a -b + 3c where a, b and c are given vectors

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ncert solutions for class 12 chapter 10 vector algebra miscellaneous exercise Question 7. If a = i + j + k , b = 2i – j + 3k and c = i – 2j + k , find a unit vector parallel to the vector 2a – b + 3c.
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How do I find vector c when vector a and b are given??? Please help out..

iris_crownyrainbow
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There should be a plus-minus before the answer

souravmahm