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Bab Barisan dan Deret
Matematika SMP Kelas VIII

Aritmatika

3, 7, 11, ...

a = 3

b = U2 - U1
b = 7 - 3
b = 4

Un = a + (n - 1) x b

U10 = a + 9b
U10 = 3 + (9 x 4)
U10 = 3 + 36
U10 = 39

✩✩ A ✩✩