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Tiempo: 5 minutos

Escriba los dos números que seguirían en cada serie.

1 20, 19, 18, 17, 16, 15, ........................

2 2, 4, 6, 8, 10, 12,

3 7, 7, 6, 6, 7, 7,

4 2, 6, 3, 6, 4, 6,

5 4, 4, 6, 6, 8, 8,

6 1, 4, 7, 10, 13, 16,

7 7, 3, 6, 3, 5, 3,

8 30, 33, 36, 39, 42, 45,

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9 3, 6, 12, 24, 48, 96,

10 34, 36, 18, 20, 10, 12,

11 1, 4, 2, 5, 3, 6,

12 70, 71, 73, 74, 76, 77,

13 66, 63, 65, 62, 64, 61,

14 3, 5, 6, 12, 14, 15,

15 5, 8, 13, 20, 29, 40,

16 52, 53, 55, 58, 62, 67,

17 1, 8, 3, 16, 5, 32,

18 2, 3, 5, 8, 12, 17,

19 28, 15, 32, 19, 36, 23,

20 10, 11, 15, 14, 20, 17,

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