3-d

Question: The radius of sphere $x+2y+2z=15$ and ${{x}^{2}}+{{y}^{2}}+{{z}^{2}}-2y-4z=11$ is



1) 2
2) $\sqrt{7}$
3) 3
4) $\sqrt{5}$
Solution: Explanation: No Explanation
Sphere

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