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  4. The radius of the circle in which the sphere x2 + y2 + z2 + 2x − 2y − 4z − 19 = 0 is cut by the plane x + 2y + 2z + 7 = 0 is

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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

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Solution:

Correct answer is (c) $3$

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