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     EduGorilla 
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    If the pair of lines ax2 + 2(a+b)xy + by2 = 0 lie along diameters of a circle and divide the circle into four sectors, such that the area of one of the sectors is thrice the area of another sector, then 

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    1. 3a2 + 2ab + 3b2 = 0
    2. 3a2 + 10 ab + 3b2 = 0
    3. 3a2 - 2ab + 3b2 = 0
    4. 3a2 - 10ab + 3b2 = 0
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