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Sganjil = 6 - 2
Sganjil = 4
rasio = Sgenap / Sganjil
= 2/4
= 1/2
S = a / (1 - r)
6 = a / (1 - 1/2)
6 = a / (1/2)
1/2(6) = a
3 = a
jadi, suku pertamanya adalah 3