ninouttevb ninouttevb
  • 24-01-2024
  • Mathematics
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Une population de 20 grenouilles se reproduit au rythme suivant : chaque jour, le nombre de grenouilles double mais 10 grenouilles meurent ce même jour.
On note Uₙ le nombre de grenouilles vivantes à la fin du nième jour.
On convient que u₁ = 20
1) Calculer u₂ et u₃
2) Exprimer uₙ₊₁ en fonction de uₙ

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