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r = U2/U1
r = (1/125)/(1/625)
r = 1/125×625/1
r = 5
U7 = ar^(n-1)
U7 = 1/625×5⁷⁻¹
U7 = 1/625×5⁶
U7 = 1/625×15625
U7 = 25