1.

If the lines `x+2ay+a=0, x+3by+b=0` and `x+4cy+c=0` are concurrent then `a,b,c` are inA. A.P.B. G.P.C. H.P.D. none of these

Answer» Correct Answer - C
Given lines will be concurrent , if
`|{:(1,2a,a),(1,3b,b),(1,4c,c):}|=0`
`implies -bc+2ac-ab=0 implies b =(2ac)/(a+c) implies a,b,c` are in H.P.


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