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n = 1 - 3 ( 1 ) + 7 = - 3 + 7 = 4
n = 2 - 3 ( 2 ) + 7 = - 6 + 7 = 1
n = 3 - 3 ( 3 ) + 7 = - 9 + 7 = -2
n = 4 - 3 ( 4 ) + 7 = - 12 + 7 = - 5
n = 5 - 3 ( 5 ) + 7 = - 15 + 7 = - 8
Aquí ya podemos observar que se le va sumando - 3
La sucesión sería
4 , 1 , - 2 , - 5 , - 8 , - 11 , - 14 , - 17 , - 20 , - 23 , - 26 , - 29 , - 32 , - 35 , - 38