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Sn=a1*(1-q^n)/(1-q)
4088=a1(1-2⁹)/(1-2)
4088=a₁*(1-512)/(-1)
4088=a₁511 dzielimy przez 511
a₁=8
an=a1*q^(n-1) obliczymy an
an=8*2^(9-1)
an=8*2⁸
an=8*256
an=2048