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suku ketiga = u3 = ar²= 120
dit. U5=..………
u3/ u1 = a.r²/ a
120/30= r²
4 = r²
r = 2 atau -2
u5 = a.r⁴
u5 = 30. 2⁴
u5 = 30 . 16
u5 = 480