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Let A(1,1) and B(3,3) be two fixed point...

Let A(1,1) and B(3,3) be two fixed points and P be a variable point such that area of `Delta PAB` remains constant and equal to 1 sq.units,for all positions of P ,then locus of P is given by
(A) 2y=2x+1 (B) 2y=2x-1 (C) y=x+1 (D) y=x-1

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