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podstawiamy 1 za n
a1 = 3/2
teraz 2
a2 = 3/4
teraz 3
a3 = 3/8
Mamy tu ciąg geometryczny, a1 = 3/2, q = 1/2
S7 =3/2 * (1- 1/2^7)/1-1/2 = 3/2 * (1-1/128)/1/2 = 3*127/128 = 381/128 = 2 125/128