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If the lines ax+12y+1=0 bx+13y+1=0 and c...

If the lines ax+12y+1=0 bx+13y+1=0 and cx+14y+1=0 are concurrent then a,b,c are in

A

A.P.

B

G.P.

C

H.P.

D

none of these

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The correct Answer is:
A
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