if the lines `x + 2ay + a = 0`, `x + 3by + b = 0` and `x + 4cy + c = 0` are concurrent, then a, b, c are in: (1) A.P.(2) G.P.(3) H.P.(4) A.G.P.

For a ne b ne c if the lines x + 2ay + a = 0 , x + 3by + b = 0 and x + 4cy + c = 0 ar concurrent , then a , b, c are in

If the lines 2x - ay + 1 = 0, 3x – by + 1 = 0, 4x-cy+1 =0 concurrent, then a, b, c are in (A) A.P. (B) G.P. (C) H.P. (D) A.G.P

If the lines x+2ay+a=0, x+3by+b=0, x+4cy+c=0 are concurrent, then a, b, c are in

If the lines : x+2ay+a=0, x+3by+b=0 and x+4cy+c=0 are concurrent, where a,b,c are non-zero real numbers, then :

If the straight lines. ax + amy + 1 = 0, bx + (m + 1)by + 1=0 and cx + (m +2)cy + 1=0, m!=0 are concurrent then a,b.c are in: (A) A.P. only for m = 1 (B) A.P. for all m (C) G.P. for all m (D) H.P. for all m

If the lines a x+2y+1=0,b x+3y+1=0a n dc x+4y+1=0 are concurrent, then a ,b ,c are in (a). A.P. (b). G.P. (c). H.P. (d). none of these

If the lines x+2ay+a=0, x+3by+b=0, x+4cy+c=0 are concurrent, then a,b and c are in

If the lines ax+2y+1=0,bx+3y+1=0 and cx+4y+1=0 are concurrent,then a,b,c are in A.P.( b) G.P.( c) H.P.(d) None of these

If the lines 2x-ay+1=0, 3x-by+1=0, 4x-cy+1=0 are concurrent, then a, b, c are in