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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 ina. A.P. b. G.P. c. H.P. d. none of theseA. A.P.B. G.P.C. H.P.D. None of these |
| Answer» Correct Answer - A | |