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If the vectors vec a=3hat i+hat j-2hat k...

If the vectors `vec a=3hat i+hat j-2hat k ,vec b = -hat i+ 3hat j + 4hat k` and `vec c= 4hat i -2hat j- 6hat k` constitute the side of a `DeltaABC` then the length of the median bisecting the vector `vec c` is (A) `sqrt2` (B) `sqrt14` (C) `sqrt24` (D) `sqrt6`

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