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3 suku berikutnya :
1, 4, 7, 10, 13, 16, 19
= 1 + (n - 1) 3
= 1 + 3n - 3
= 3n - 2
3 Suku berikutnya
= 3(5) - 2 = 13
3(6) - 2 = 16
3(7) - 2 = 19
n = suku ke ..