" the lines "ax+12y+1=0,bx+13y+1=0" and "cx+14y+1=0" are "

If the lines a x+12 y+1=0,\ b x+13 y+1=0 and c x+14 y+1=0 are concurrent, then a , b , c are in

If the lines a x+12 y+1=0,\ b x+13 y+1=0 and c x+14 y+1=0 are concurrent, then a , b , c are in a. H.P. b. G.P. c. A.P. d. none of these

If the lines a x+12 y+1=0,\ b x+13 y+1=0 and c x+14 y+1=0 are concurrent, then a , b , c are in a. H.P. b. G.P. c. A.P. d. none of these

I the lines a x+12 y+1=0,\ b x+13 y+1=0 and c x+14 y+1=0 are concurrent, then a , b , c are in a. H.P. b. G.P. c. A.P. d. none of these

The lines ax + 2y + 1 = 0, bx + 3y +1 =0 and cx + 4y + 1=0 are concurrent if a, b, c are in A.P.

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 ax+2y+1=0,bx+3y+1=0 and cx+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 a,b,c are in A.P.prove that the straight lines ax+2y+1=0,bx+3y+1=0 and cx+4y+1=0 are concurrent.