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Bab Barisan dan DeretMatematika SMP Kelas VIII
b = (U13 - U6)/(13 - 6)
b = (63 - 28)/7
b = 35/7
b = 5
a = U6 - 5b
a = 28 - 5 . 5
a = 28 - 25
a = 3
Un = a + (n - 1) b
Un = 3 + (n - 1) . 5
Un = 3 + 5n - 5
Un = 5n - 2