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If the vectors bar A B=3 hat i+4 hat k ...

If the vectors ` bar A B=3 hat i+4 hat k` and ` bar A C=5 hat i-2 hat j+4 hat k` are the sides of a triangle ABC, then the length of the median through A is (1) `sqrt(72)` (2) `sqrt(33)` (3) `sqrt(45)` (4) `sqrt(18)`

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