Completa la serie: 4, __, 12, __, 20, __, 8,16,24, 6,14,22, 7,13,19, 5,10,15, Completa la serie: 2, __, 6, __, 10, __, 3,7,11, 6,8,10, 5,9,13, 4,8,12, Completa la serie: 30, __, 24, __, 18, __, 28,22,16, 26,20,14, 27,21,15, 25,19,13, Completa la serie: 7, __, 21, __, 35, __, 10,20,30, 14,28,42, 12,24,36, 15,25,45, Completa la serie: 50, __, 40, __, 30, __, 45,35,25, 44,34,24, 48,38,28, 46,36,26, Completa la serie: 9, __, 27, __, 45, __, 20,40,50, 15,30,60, 12,24,48, 18,36,54

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