If vector(2i + j + k), vector(6i - j + 2k) and vector(14i - 5j + 4k) be the position vectors of the points A,B and C respectively, then
(a) A,B,C are collinear
(b) A,B,C are non-collinear
(c) vector AB perpendicular BC
(d) none of these
Answer is (a) A,B,C are collinear
