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 a x+2y+1=0,b x+3y+1=0a n dc x+4y+1=0 are concurrent, then a ,b ,c are a. A.P. b. G.P. c. H.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

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

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 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

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 a ,b ,a n dc are in G.P., then the equations a x^2+2b x+c=0a n ddx^2+2e x+f=0 have a common root if d/c , e/b ,f/c are in a. A.P. b. G.P. c. H.P. d. none of these

If a ,b ,c are in A.P., the a/(b c),1/c ,1/b will be in a. A.P b. G.P. c. H.P. d. none of these

If a ,b ,c are in A.P., the a/(b c),1/c ,1/b will be in a. A.P b. G.P. c. H.P. d. none of these