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7.
Let a, b, c be in arithmetic progression. Let the centroid of the triangle with vertices
10 7
(a,c),(2,b) and (a,b) be . If a, ß are the roots of the equation ax2 + bx +1 = 0,
33
then the value of a? +B2 - aß is :
(3)
(4)
(1) 256
71
(2) -
69
256
69
256
71
256


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