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  1. The volume of two spheres are in the ratio 8 : 27. The ratio of their surface area is :
    1. 4 : 9
    2. 2 : 3
    3. 4 : 5
    4. 5 : 6
Correct Option: A

Let the volume be 8x³ and 27x³
⇒ Their radius are 2x and 3x
∴ The ratio of their surface area = 4x² : 9x² = 4 : 9


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