January 2019 0 17 Report
PRosze o wytłumaczenie krok po kroku skad to sie wzielo

q=6/18=1/3
Sn=a1(1-q^n)/(1-q)
S8=18*(1-(1/3)^8)/(1-1/3) <------- dotąd wiem dalej juz nie ;(

skąd wzieło się 6560/243=26 i242/243 ??/
S8=18*3/2*(1-1/6561)=27*(6560/6561)=6560/243=26 i 242/243
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