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Sagot :

Bonsoir,

[tex]2) \: V _{n} = 2V_{n - 1} - 3(n - 1)[/tex]

[tex]\Leftrightarrow \: \: V _{n} = 2V_{n - 1} - 3n + 3[/tex]

[tex]3) \: V _{n + 2} = 2V_{n + 1} - 3(n + 1)[/tex]

[tex]\Leftrightarrow \: V _{n + 2} = 2V_{n + 1} - 3n - 3[/tex]

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