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A square is inscribed in the circle x 2 + y 2 – 10x – 6y + 30 = 0. One side of this square is parallel to y = x + 3. If (x i , y i ) are the vertices of the square, then ) y x ( 2 i 2 i + Σ is equal to :

1. 148
2. 156
3. 160
4. 152

Correct answer: 152

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