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a = U1 = 8 , U2 = 4 , U3 = 2
r = U2 / U1
r = 4/8
r = 1/2
Suku ke 10
U10 = ar⁹
U10 = (8) (1/2)⁹
U10 = 8 x 1/512
U10 = 8/512
U10 = 1/64