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b = 40 ÷ 5
b = 8
a = U4 - 3b
a = 110 - 3(8)
a = 110 - 24
a = 86
Un = a + (n-1) b
U30 = 86 + (30-1) 8
U30 = 86 + 29 . 8
U30 = 172