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a = suku pertama
b = beda = U2 - U1
Un = a + (n - 1)b
Sn = (n/2)(a + Un)
Pada geometri:
a = suku pertama
r = rasio = U2/U1
Un = ar^(n - 1)
Sn = a(r^n - 1)/(r - 1)