a1 =128
q = -1/2
n = 7
Sn = a1*[1-q^{n} / 1-(-1/2)] = 128*[1-(-1/2)^{7} / 3/2] = 128*[1-(-1/128) / 3/2] = 128*[129/128 / 3/2] = 128*129/128*2/3 = 86 (Skraca sie 128 ze 128 i 129 z 3)
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a2= 64
a3= 32
a4 = 16
a5 = 8
a6 = 4
a7 = 2
a1+ a2+...+a7 = 254
a1 =128
q = -1/2
n = 7
Sn = a1*[1-q^{n} / 1-(-1/2)] = 128*[1-(-1/2)^{7} / 3/2] = 128*[1-(-1/128) / 3/2] = 128*[129/128 / 3/2] = 128*129/128*2/3 = 86 (Skraca sie 128 ze 128 i 129 z 3)