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Tenemos.
Formula de progresiones aritmeticas.
an = a₁ + (n - 1)d
an = Ultimo termino
a₁ = Primer termino
d = diferencia.
n = numero de terminos de la progresion
7 - - - - 27
n = 6
a₁ = 7
an = 27
Hallas d
27 = 7 + (6 - 1)* d
27 = 7 + 5d
27 - 7 = 5d
20 = 5d
20/5 = d
4 = d
a₁ = 7
a₂ = 7 + 4 = 11
a₃ = 11 + 4 = 15
a₄ = 15 + 4 = 19
a₅ = 19 + 4 = 23
a₆ = 23 + 4 = 27
Respuesta.
La progresion.
7. 11 . 15 . 19 . 23 . 27