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If the lines x+2ay+a=0, x+3by+b=0, x+4cy...

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

A

arithmetic progression

B

geometric progression

C

harmonic progression

D

arithmetic-geometric progression

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The correct Answer is:
C
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