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If the lines a x+2y+1=0,b x+3y+1=0 and c...

If the lines `a x+2y+1=0,b x+3y+1=0` and `c x+4y+1=0` are concurrent, then `a , b , c` are in `AdotPdot` (b) `GdotPdot` (c) H.P. (d) None of these

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