if the lines x + 2ay + a = 0, x + 3by +...

if the lines `x + 2ay + a = 0`, `x + 3by + b = 0` and `x + 4cy + c = 0` are concurrent, then a, b, c are in: (1) A.P.(2) G.P.(3) H.P.(4) A.G.P.

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