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a1 = 6 (a1 = al 1er termino de la progresion)
d = 4 (d = la razon )
n = ?
an = 78 ( an = ultimo termino de la progresion)
an = a 1 + (n - 1) * d
78 = 6 + (n - 1) * 4
78 - 6 = 4n - 4
72 = 4n - 4
72 +4 = 4n
76 = 4n
76/4 = n
19 = n
Respuesta.
El lugar que ocupa el valor de 78 es el termino 19