If the position vectors of the vertices of a triangle are 2i - j + k, i - 3j - 5k, 3i - 4j - 4k then it is

The position vector of the centroid of the triangle formed by the points i + j + k, i - j + k, -i + j + k is

The vectors 2i - 3j + k, I - 2j + 3k, 3i + j - 2k

The P.V.'s of the vertices of a triangle are 2i+3j+4k,4i+6k+3k,3i+2j+3k P.V.of orthocentre is :

If the position vectors of A and B are 3i - 2j + k and 2i + 4j - 3k then |vec(A)B|

If the position vectors of A, B are 2i - 9j - 4k, 6i - 3j + 8k then the unit vector in the direction of vec(A)B is

The position vector of the centroid of the Delta ABC is 2i + 4j + 2k . If the position vector of the vertex A is 2i + 6j + 4k, then the position vector of midpoint of BC is a)2i + 3j + k b)2i + 3j - k c)2i - 3j - k d) -2i - 3j - k