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If the vectors vec(AB)=3hati+4hatk and v...

If the vectors `vec(AB)=3hati+4hatk and vec(AC)=5hati-2hatj+4hatk` are the sides of a triangle ABC, then the length of the median through A is (A) `sqrt(33)` (B) `sqrt(45)` (C) `sqrt(18)` (D) `sqrt(720`

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