Respuesta :

Answer:

18

Step-by-step explanation:

Answer

66

Step-by-step explanation:

1-1    1-2     1-3    1-4   1-5  1-6

2-1   2-2    2-3   2-4   2-5   2-6

3-1  3-2  3-3  3-4  3-5  3-6  

4-1  4-2  4-3 4-4  4-5  4-6  

5-1  5-2  5-3  5-4  5-5  5-6

6-1  6-2  6-3  6-4  6-5  6-6

and then you can repeat every thing but backwards

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