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Un=a+(n-1)b
Sn=½ n(2a+(n-1)b)
kalau barisan geometri:
Un=ar^n-1
Sn= a(r^n - 1) / r-1 jika r lebih besar dari 1
Sn= a(1- r^n) / 1-r jika r lebih kecil dari 1