awal = 30
pertambahan = 4
n=10
Un = a + (n-1)b
Un = 30 + (n-1)(4)
U20 = 30 +(19)(4)
U 20 = 106
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awal = 30
pertambahan = 4
n=10
Un = a + (n-1)b
Un = 30 + (n-1)(4)
U20 = 30 +(19)(4)
U 20 = 106