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If the lines : x+2ay+a=0, x+3by+b=0 and ...

If the lines : x+2ay+a=0, x+3by+b=0 and x+4cy+c=0 are concurrent, where a,b,c are non-zero real numbers, then :

A

`1/a,1/b,1/c` are in A.P.

B

`1/a,1/b,1/c` are in G.P.

C

a,b,c are in A.P.

D

a,b,c are in G.P.

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MODERN PUBLICATION-CONIC SECTIONS-EXERCISE
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