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15. If the lines ax+y+1=0, x+by+1=0, x+y+c=0 (a,b and c are distinct and different from 1) are concurrent then the value of a/(a-1) + b/(b-1) + c/(c-1) is a)0. b)1. c)2. d)3. |
| Answer» 15. If the lines ax+y+1=0, x+by+1=0, x+y+c=0 (a,b and c are distinct and different from 1) are concurrent then the value of a/(a-1) + b/(b-1) + c/(c-1) is a)0. b)1. c)2. d)3. | |