Question

Points P and Q are taken on the ellipse 2(3x+y-1)^2 + 3(x-3y+4)^2=80. If a,b,c,d are the lengths of the sides of quadrilateral PAQB where A and B are foci of the ellipse then a^3+b^3+c^3+d^3 is always greater than :-
A) 14
B) 18
C) 28
D) 30

Answer 1

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