question_answer 1)

If the vertices A, B, C or a triangle ABC have position vectors (1, 2, 3), (?1, 0, 0), (0, 1, 2) respectively then find   

Answer:

Given, position vector of point       Position vector of point       Position vector of point       of point A ? P.V. of point B                               of point C-P.V. of point B