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If vector c of magnitude 20sqrt(6) par...

If vector `c` of magnitude `20sqrt(6)` parallel to the bisector of the angle between ` vec a=7 hat i-4 hat j-4 hat ka n d vec b=-2 hat i- hat j+2 hat k` is `+-(20)/3(2 hat i+7 hat j+ hat k)` b. `+-3/(20)( hat i+7 hat j+2 hat k)` c. `+-(20)/3( hat i-2 hat j+7 hat k)` d. `+-(20)/3( hat i-7 hat j+2 hat k)`

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