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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

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