If the lines x+2ay+a=0, x+3by+b=0, x+4cy+c=0 are concurrent, then a, b, c are in

Question

If the lines

x + 2 a y + a = 0, x + 3 b y + b = 0, x + 4 c y + c = 0

are concurrent, then

a, b, c

are in

Arithmetic progression

Geometric progression

Harmonic progression

Arithmetico-Geometric progression

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