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7, 10, 13, ...
Primero hallamos d:
d = 10 - 7
d = 3
Datos
a₁ = 7
d = 3
n = 9
a₉ = ?
Formula
an = a₁ + (n -1) d
a₉ = 7 + (9 - 1) 3
a₉ = 7 + 8*3
a₉ = 7 + 24
a₉ = 31