Dire si chaque suite definie sur N est arthmétique ou non ;Donner sa raison


un= 1/5n- 4
= 1/5( n+1) -4
= 1/5 n+ 1/5 - 4 - 1/5 n+4
R = 1/5
Sa raison est 1/5 ..... Elle est arithmétique car : c'est une constante .

Corrigez moi svp

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