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b = 4 - 1 = 3
Un = 79
Un = a + (n - 1)b
79 = 1 + 3(n - 1)
78 = 3n - 3
3n = 81
n = 27
Un = a+(n-1)b => 79 = 1+3(n-1) => 79 = 1+3n-3
n = 81/3 = 27