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The equation of the circle which inscrib...

The equation of the circle which inscribes a suqre whose two diagonally opposite vertices are `(4, 2) and (2, 6)` respectively is : (A) `x^2 + y^2 + 4x - 6y + 10 = 0` (B) `x^2 + y^2 - 6x - 8y + 20 = 0` (C) `x^2 + y^2 - 6x + 8y + 25 = 0` (D) `x^2 + y^2 + 6x + 8y + 15 = 0`

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