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aд = a₁ + (n-1)d , donde d es la diferencia de 2 terminos continuos
para tu problema,
a₁ = 4
d = 7-4 = 3
entonces el termino de lugar 9 será:
a₉ = a₁ + (9-1)*3
a₉ = 4 + 8*3
a₉ = 4+24
a₉ = 28