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Kelas 8 MatematikaBab Barisan dan Deret Bilangan
1/3, 1/7, 1/11
Pada penyebut
3, 7, 11
b = U2 - U1
b = 7 - 3
b = 4
Un = a + (n - 1) . b
Un = 3 + (n - 1) . 4
Un = 3 + 4n - 4
Un = 4n - 1
Un = 1/(4n - 1)