Prove that the points `(a ,b+c),(b ,c+a)a n d(c ,a+b)` are collinear.

Prove that the points (a, b + c), (b , c+a) and (c, a+b) are collinear and find the equation of the straight line containing them .

Prove that the points (a,b+c),(b,c+a) and (c,a+b) are collinear.

Prove that the points (a,b+c),(b,c+a) and (c,a+b) are collinear and find the equation of the straight line containing them.

Show that the points (a,b+c),(b,c+a) and (c,a+b) are collinear.

Prove that the points (a+b+c),(b,c+a) and (c,a+b) are collinear.

Prove that the points (a, b + c), (b, c + a) and (c, a + b) are collinear.

Show that the points (a,b+c) (b,c+a) and (c,a+b) are collinear.

Show that the points A(a,b+c), B(b,c+a) and C(c,a+b) are collinear.

Prove that the points (a, b), (c, d) and (a-c, b-d) are collinear, if ad = bc.

Prove that the points (a, b), (c, d) and (a-c, b-d) are collinear, if ad = bc.