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If a parallelogran is constructed on th...

If a parallelogran is constructed on the vectors `bar a=3bar p-bar q,bar b =bar p+ 3 bar q` and `|bar p|=|bar q|=2` and angle between `barp` and `barq` is `pi/3`, then the ratio of the lengths of the sides is (A) `sqrt7:sqrt13` (B) `sqrt6:sqrt2` (C) `sqrt3:sqrt5` (D) `1:2`

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