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59 adalah suku ke 15
Un = a + (n - 1).b
59 = 3 + (n - 1).4
59 = 3 + 4n - 4
59 = 4n - 1
4n = 59 +1
4n = 60
n = 60/4
n = 15
jadi, 59 merupakan suku yang ke 15