If the lines a x+12 y+1=0,\ b x+13 y+1=0...

If the lines `a x+12 y+1=0,\ b x+13 y+1=0` and `c x+14 y+1=0` are concurrent, then `a , b , c` are in a. H.P. b. G.P. c. A.P. d. none of these

A

AP

B

GP

C

HP

D

AGP

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B

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