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r = 1/(1/2) = 2
Un = ar^(n - 1)
= (1/2)(2)^(n - 1)
= (1/2)(2)^n / (2)
= (1/4)2^n
= 2^(n - 2)
U₃ = 2^(3 - 2) = 2
U₇ = 2^(7 - 2) = 32
maka suku ke 3 =n3=2
dan suku ke 7=n7=32