The solution set of the inequation \( x^{2}+(a+b) x+a b0 \), where \( ab \), is (A) \( (a, b) \)...

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The solution set of the inequation \( x^{2}+(a+b) x+a b0 \), where \( ab \), is
(A) \( (a, b) \)
(B) \( (-\infty, a) \cup(\dot{b}, \infty) \)
(C) \( (-b,-a) \)
(D) \( (-\infty,-b) \cup(-a, \infty) \)
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