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calculati suma S=5 (1/5+1/25+...+1/5n+1)

Răspuns :

avem o serie geometrica cu primul termen 1 si ratia 1/5
deci S=1+1/5+1/5^2+...+1/5^n= 1-1/5^(n+1)/1-1/5= 1/4 (5-1/5^n)

O seara buna!