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q=1/2
wzór na 10 pierwszych wyrazów
s10= a1(1-q^10)/(1-q)
zatem
s10= 3*(1-(1/2)^10)/(1-1/2)
s10= (3*1023/1024)/1/2
s10= (3069/1024)*2
s10= 6138/1024
s10= 5,994140625