Three solid cheese balls with diameters of 2 inches, 4 inches, and 6 inches, respectively, were melted into a single cheese ball. What was the approximate diameter, in inches, of the new cheese ball? (The volume of a sphere is $$\frac{4}{3} \pi r^3$$, where r is the radius.)
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A12
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B16
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C$$\sqrt[3]{16}$$
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D3$$\sqrt[3]{8}$$
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E2$$\sqrt[3]{36}$$
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正确答案: E