Gọi \(d=ƯCLN\left(2n+1,3n+2\right)\) (\(d\in N\)*)
\(\Rightarrow\left\{{}\begin{matrix}2n+1⋮d\\3n+2⋮d\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}6n+3⋮d\\6n+4⋮d\end{matrix}\right.\)
\(\Rightarrow1⋮d\)
Vì \(d\in N\)*; \(1⋮d\Rightarrow d=1\)
\(\RightarrowƯCLN\left(2n+1;3n+2\right)=1\)
\(\Rightarrow\) Phân số \(\dfrac{2n+1}{3n+2}\) tối giản với mọi \(n\in N\)