MathematicsEasy179×since 2002Q4229If limx→1x2−ax+bx−1=5\mathop {\lim }\limits_{x \to 1} {{{x^2} - ax + b} \over {x - 1}} = 5x→1limx−1x2−ax+b=5, then a + b is equal to :A1B- 4C- 7D5Check answerSkip