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If the straight lines. ax + amy + 1 = 0,...

If the straight lines. `ax + amy + 1 = 0, bx + (m + 1)by + 1=0` and `cx + (m +2)cy + 1=0,` `m!=0` are concurrent then a,b.c are in: (A) `A.P. only for m = 1` (B) `A.P. for all m` (C) `G.P. for all m` (D) `H.P. for all m`

A

AP only for m=1

B

AP for all m

C

GP for all m

D

HP for all m

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