Soit $n\in \mathbb{N^*}$, on pose:
$$\begin{cases} a_n=15n^2+8n+6\\b_n=30n^2+21n+13\\
\end{cases}$$
Calculer: $~~~b_n -2a_n~~$ et en déduire que: $~~a_n\land b_n=1$
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