Find the mean of the cubes of first n even natural numbers

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Please find below the solution to the asked query:

$$\begin{gathered} \mathrm{Cubes} \mathrm{of} \mathrm{first} \mathrm{n} \mathrm{even} \mathrm{natural} \mathrm{means}: \\ {2}^3, 4^3, 6^3,.....{\left(2\mathrm{n}\right)}^3 \end{gathered}$$

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