If a = 3i - 2j + k, b = -i + j + k then the unit vector parallel to the vector a + b is

If a = 3i - 2j + k and b = i + 2j + 5k, then the unit vector along a - b is

If a = i + j - 2k, b = -i + 2j + k, c = i - 2j + 2k, then a unit vector parallel to a + b + c =

The unit vectors parallel to i-3j-5k is

If vec a = hat i + hat j + hat k , vec b = 2 hat i - hat j + 3 hat k and vec c = hat i - 2 hat j + hat k , find a unit vector parallel to the vector 2 veca - vec b + 3 vec c

If a = I + j, b = j + k and c = k +i , a unit vector parallel to a + b + c is

If vec a = i+j-2k, vec b = -i+2j+k and vec c = i-2j+2k then a unit vector parallel to vec a + vec b + vec c is

If a = i + j, b = j + k and c = i + k then a unit vector in the direction of a - 2b + 3c is

If vec a = -i +j +k, vec b = i-j+k , then a unit vector perpendicular to vec a and vec b is