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

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 = 3i - 2j + k, b = 2i - 4j - 3k, c = -i + 2j + 2k then a + b + c =

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

If a = I + j - k, b = I - j + k, c = I - j - k then a xx (b xx c) =

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

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

If a = i - j + 2k, b = 2i + 3j + k, c = i - k , then magnitude of a + 2b-3c is

If a = i- 2j + k, b = 2i + j - k, c = 4i + 4j + 3k then |(a xx b) xx c| =