If the vector has magnitude

MATHEMATICS · Single correct · CBSE · Mathematics · Vector Algebra · Vector Algebra

Problem

If the vector r=ai+2j−3k\mathbf{r}=a\mathbf{i}+2\mathbf{j}-3\mathbf{k} has magnitude 77, the positive value of aa is (a) 45\sqrt{45} (b) 66 (c) 77 (d) 22

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