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Verified answer
Un = 1/2n (n - 3)U-12 ..?
Un = 1/2n (n - 3), maka
U-12 = 1/2 (12) (12 - 3)
U-12 = 6 (9)
U-12 = 54
jadi suku ke-12 = 54.
Un = 1/2n (n - 3)
U12 = 1/2 (12) (12 - 3)
U12 = 6 (9)
U12 = 54
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