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b = 8-3 = 5
Un = a +(n-1)b
Un = 3 + (n-1)5
Un = 3 + 5n - 5
Un = 5n -2
U10 = 5n - 2
U10 = 5(10)-2
U10 = 50-2
U10 = 48
U17 = 5n - 2
U17 = 5(17) - 2
U17 = 85 - 2
U17 = 83