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b = 3
Un = 67
Un = U1 + (n-1)b
67 = 1 + (n-1)3
66 = 3n - 3
69 = 3n
n = 69/3
n = 23
jadi suku yang bernilai 67 adalah suku ke 23
b = 3
Un = a+(n-1)b
= 1+(n-1)3
= 3n-2
67 = 3n-2
69 = 3n
n = 23
suku ke-23