The unit vector parallel to the resultant of the vectors A→=4i^+3j^+6k^ and B→=−i^+3j^−8k^ is
17(3i^+6j^−2k^)
17(3i^+6j^+2k^)
149(3i^+6j^−2k^)
149(3i^−6j^+2k^)
Resultant of vectors A→ and B→R→=A→+B→=4i^+3j^+6k^−i^+3j^−8k^R→=3i^+6j^−2k^R^=R→|R→|=3i^+6j^−2k^32+62+(−2)2=3i^+6j^−2k^7