If a, b, c are all different and the equations ax+ ay + (a+1) = 0 bx + b°y + (ba 1) = 0 cx + c2y + (c3 1) 0 are consistent then abc equals to

If a, b, c are all different and the equations ax+ ay + (a+1) = 0 bx + b°y + (ba 1) = 0 Cx + c2y + (c3 1) 0 are consistent then abc equals to