Question

Determinati elemente multimii A={n∈N cu conditia ca 3n-3,7<2n }

Answer 1

$3n-3,7\ \textless \ 2n \Leftrightarrow 3n-2n\ \textless \ 3,7 \Leftrightarrow n\ \textless \ 3,7. \\ \\ n \in N \Rightarrow n \in \{0,1,2,3\}. \\ \\ Deci~\boxed{A=\{0,1,2,3\}}.$