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Entonces: a40 = a1 + (40 - 1) d → 120 = a1 + 39d
a20 = a1 + (20 - 1) d → 40 = a1 + 19d
Luego restamos ambas ecuaciones quedando : 80 = 20d
d = 4 (diferencia)
Finalmente reemplazamos : 40 = a1 + 19(4)
40 = a1 + 76
a1 = -36
El primer termino es -36