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If lim(x→1) x^2 - ax + b/x - 1 = 5, then a + b is equal to :

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If lim(x→1) x2 - ax + b/x - 1 = 5, then a + b is equal to :

(1) 1 (2) – 4 (3) – 7 (4) 5 

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Correct option(3) -7

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