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Un = a + (n - 1)b
Sn = (n/2)(a + Un)
Pada Geometri
Un = ar^(n - 1)
Sn = a(r^n - 1)/(r - 1) ; utk r > 1
= a(1 - r^n)/(1 - r) ; utk 0 < r < 1
Sn = n/2 (a kuadrat =(n-1)b)