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5° 17
razon = 4
Tn = a +(n-1)r ...n es el num de termino
Tn = a + (n-1)4
4° a + 12 = 13......a = 1
5° a + 16 = 17......a = 1
primer termino:
a +(n-1)4
=1 +(1-1)4
=1