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Verified answer
A = 4r = 8 / 4 = 2
Un = a.rⁿ⁻¹
64 = 4 . 2ⁿ⁻¹
2⁶ = 2² . 2ⁿ⁻¹
2⁶ = 2ⁿ⁻¹⁺²
2⁶ = 2ⁿ⁺¹
n + 1 = 6
n = 6 - 1
n = 5
maka banyaknya suku adalah 5 suku