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Q.

If the vectors a→=3i^+j^-2k^,b→=-i^+3j^+4k^ and c→=4i^-2j^-6k^ constitute the sides of a ∆ABC, then the length of the median bisecting the vector c→ is

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a

3

b

14

c

74

d

6

answer is D.

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Detailed Solution

The median bisecting the vector c →=122b2→+2a2→-c2→ =122(26)+2(14)-56=1224=6

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