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(20 - 2) ÷ (9 - 3 )
18 ÷ 6
3
a (awal/suku pertama) =
U3 = a + (n - 1) b
2 = a + (2 - 1) 3
2 = a + 3
a = 1
suku ke 10
Un = a + (n - 1)b
1 + (10 -1) 3
1 + 27
28