Show that the points `(2," "3," "4)," "(" "1," "" "2," "1)," "(5," "8," "7)` are collinear.

Show that the points P" "(-2," "3," "5) , Q" "(1," "2," "3) and R (7," "0," "-1) are collinear.

Using direction ratios show that the points P(2, 3, 4) Q(-1, -2, 1) and R(5, 8, 7) are collinear.

Show that the points A (2, 3, -4) , B (1, - 2, 3) and C (3, 8, -11) are collinear.

Using section formula, show that the points A(1, 2, 1), B(2, 1, 0) and c(7/5, 8/5, 3/5) are collinear.

Using section formula, show that the points A(1, 2, 1), B(2, 1, 0) and c(7/5, 8/5, 3/5) are collinear.

Show that the points A (2, -3, -4) , B (1, 2, 3) and C (3, -8, -11) are collinear.

Show that the points A(2, 3, -4), B(1, - 2, 3) and C(3, 8, - 11) are collinear.

Show that the points A (4 , 7 , -6) , B (2 , 5 , -4) and C ( 1 , 4 , -3) are collinear.

Show that the points : (4, 7, 8), (2, 3, 4), (- 1, - 2, 1), (1, 2, 5) are the vertices of a parallelogram.

Show that the points A(2, 3, -4), B(1, -2, 3) and C(3, 8, -11) are collinear.