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ket : (n-1) = pangkat
dik :
n=10
r = 4
1. Sn = 1.4¹°⁻¹
=1.4⁹
=1.262.144
S₁₀=126.144
2. Sn = 5.2¹°⁻¹
= 5.2⁹
=5.512
S₁₀=2.560
:)