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b = U15 - U10 / 15 - 10
b = 48 - 33 / 5
b = 15 / 5
b = 3
mencari a
U10 = a + (n-1) x b
33 = a + (10-1) x 3
33 = a + (9 x 3)
33 = a + 27
a = 33 - 27
a = 6
Jadi 5 suku pertama = 6, 9, 12, 15 dan 18