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Volume of the original sphere = (4/3)πR³, where R = 16 cm. Volume of each smaller sphere = (4/3)πr³, where r is the radius of the smaller sphere. Since the original sphere is recast into 64 smaller spheres: (4/3)π(16³) = 64 × (4/3)πr³. Cancel (4/3)π on both sides: 16³ = 64 × r³. Simplify: r³ = 16³/64 = 16²/4 = 64. r = 4 cm. Correct answer: b. 4 cm
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