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jadi, r = 1/25
U4 = U1 x r³
5 = U1 x (1/25)³
5 = U1 x 1/15625
U1 = 5 : 1/15625
U1 = 5 x 15625
U1 = 78125
U3 = U1 x r² = 78125 x (1/25)² = 78125 x 1/625 = 125
jadi suku ke 3 adalah 125