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a r⁴ = 4
-> r³ = 8, maka, r = 2
substitusi nilai r :
a r = 1/2
a(2) = 1/2
a = 1/4
U7 = a r⁶
U7 = 1/4 . 2⁶
U7 = 1/4 . 64
U7 = 16
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