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Zelel
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1) 1 2 6 24 120 720

 

On multiplie le chiffre par sa position et on y ajoute le chiffre de base.

ex : 6 x 3 + 6 = 24 / 24 x 4 + 24 = 120 / 120 x 5 + 120 = 720 ...

 

2) 1 1 2 5 12 28 65 151 351 816

 

On multiplie le chiffre par 2 et on y ajoute la somme de tous les chiffres précédents en excluant le dernier.

ex : 151 x 2 + (1 + 1 + 2 + 5 + 12 + 28) = 351 / 351 x 2 + ( 1 + 1 + 2 + 5 + 12 + 28 + 65) = 816 ...

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