By melting a solid lead sphere of diameter 12 cm, three small spheres are made whose diameters are in the ratio 3:4:5. The radius (in cm) of the smallest sphere is

By melting a solid lead sphere of diameter 12 cm, three small spheres are made whose diameters are in the ratio 3:4:5. The radius (in cm) of the smallest sphere is
1). 3
2). 6
3). 1.5
4). 4

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