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Bab Barisan dan DeretMatematika SMP Kelas VIII
1, 7, 13, 19, 25, ...
b = U2 - U1
= 7 - 1
= 6
Un = a + (n - 1) . b
= 1 + (n - 1) . 6
= 1 + 6n - 6
= 6n - 5