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U1=a = 625
--------------------- :
r³=1/125
r=³√(1/125)
r=1/5
jadi rasionya 1/5
u4 = ar³ = 5
u4/u1
ar³/a = 5/625
r³ = 1/125
r = ∛(1/125)
r = 1/5