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Jadi
U1 = 3
U2 = 9
U3 = 27
r = U2/U1 = 3
a = 3
Sn = a(r^n - 1) ÷ (r - 1)
Jadi Sn = 3(3^n - 1) ÷ (3 - 1)
Sn = (3^(n+1) - 3) ÷ 2
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