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a2=a1q
a6=a1q^5
a1q=3
a1q^5=243
q^4=81
q=3
a1=1
Sn=a1(1-q^n)/(1-q)
s8=1(1-3^8)/(-2)=3`280
^- oznacza do potegi
S8 suma wyrazów od 1 do 8