Missing number 999,730,510,345,213,?

Dear Student,

Please find the below the required solution solution.
$$\begin{gathered} \mathrm{rewriting} \mathrm{the} \mathrm{above} \mathrm{series} \mathrm{in} \mathrm{understandable} \mathrm{expansion} \\ {10}^3-1=1000-1=999 , \\ 9^3+1=729+1=730, \\ 8^3 - 2 = 512 - 2 = 510, \\ 7^3 + 2 = 343 + 2 = 345, \\ 6^3 + 3 = 216 - 3 = 213 \\ so next term is 5^3 + 3 = 125 + 3 = 128, \\ \mathrm{hence} \mathrm{missing} \mathrm{number} \mathrm{is} 128 \end{gathered}$$


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