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The distance from the center of the circ...

The distance from the center of the circle `x^2+y^2=2x` to the common chord of the circles `x^2+y^2+5x-8y+1=0` and `x^2+y^2-3x+7y-25=0` is
(a) 2 (b) 4 (c) `(34)/(13)` (d) `(26)/(17)`

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