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\begin{subequations}  \textbf{When n is doubled, the time develops as follows:}  \begin{align}  Algo1, O(n^3): (2n)^3 & &  = 8n^3, \\ Algo2, O(n^2): (2n)^2 & &  = 4n^2, \\ Algo3, O(n^1): (2n)^1 & &  = 2n \end{align}  \end{subequations}