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Verified answer
Kelas 8 MatematikaBab Barisan dan Deret Bilangan
U1 = 12 = 3 . 4
U2 = 20 = 4 . 5
U3 = 30 = 5 . 6
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Un = (n + 2) . (n + 3)
Un = n² + 5n + 6