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Questions  >>  JEEMAIN and NEET  >>  Mathematics  >>  Class12  >>  Vector Algebra
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A unit vector coplanar with the vectors $\hat i-\hat j\:\;and\:\:\hat i+2\hat j$ and is $\perp$ to the first vector, $\hat i-\hat j$ is ?

$\begin{array}{1 1} (a)\:\large\frac{1}{\sqrt 2}(\hat i+\hat j)\:\:\\ (b)\:\large\frac{1}{\sqrt 5} (2\hat i+\hat j)\\(c)\:\large\frac{1}{\sqrt 2}(\hat i+\hat k)\\(d)\:None\:of\:these. \end{array} $

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