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a, a +5, a +2(5), a +3(5),.....
Tn = a + (n-1)5 , donde n es el número de término.
T14 = a + (14-1)5
T14 =a + 13(5)
T14 = a + 65
70 = a + 65
a = 5 = 1er término
An = Ultimo termino = 70
Razón(r) = 5
Numerro de termino = n = 14
a₁ = Primer termino
Formula
an = a₁ + (n - 1)* r
70 = a₁ + (14 - 1) * 5
70 = a₁ + (13) * 5
70 = a₁ + 65
70 - 65 = a₁
5 = a₁
Respuesta.
El primer termino es el 5