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Q)

The radius of the circle in which the sphere $x^2 + y^2 + z^2 + 2x - 2y - 4z - 19 = 0$ is cut by the plane $x + 2y + 2z + 7 = 0$ is :


( A ) 3
( B ) 4
( C ) 1
( D ) 2

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