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beda (b) = 7-4 = 3
Un = a+(n-1)b
U20 = 4 + (20-1)3
U20 = 4 + 19 . 3
U20 = 4 + 57
U20 = 61
b = 7 - 4 = 3
Un = a + (n - 1)b
U20 = 4 + (20-1)3
U20 = 4 + 19 * 3
U20 = 4 + 57
U20 = 61