[" 46.If the lines "ax+12y+1=0,bx+13y+1=...

[" 46.If the lines "ax+12y+1=0,bx+13y+1=0" and "cx+14y+1=0" are "],[" concurrent,then "a,b,c" are in : "],[[" (1) H.P."," (2) "" G.P."," (3) A.P."," (4) "abc=1]]

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