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If the lines a x+2y+1=0,b x+3y+1=0a n dc...

If the lines `a x+2y+1=0,b x+3y+1=0a n dc x+4y+1=0` are concurrent, then `a ,b ,c` are in a. A.P. b. G.P. c. H.P. d. none of these

A

A.P.

B

G.P.

C

H.P.

D

None of these

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