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The radii of two spheres are in the ratio 1 : 2 . The ratio of their surface areas is?

1 : 2
1 : 4
1 : √2
3 : 8

Correct Answer: 1 : 4

Explanation:

Let their radii be x and 2x .
Ratio of their surface areas = [4πx²]/[4π(2x)²] = 1/4 = 1 : 4

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