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aₓ = a₁ + (x-1)r
aₓ : termino de lugar x
a₁ : primer termino
r: razon
a₃ = a₁ + (3-1)r a₇ = a₁ + (7-1)r
13 = a₁ + 2r 37 = a₁ + 6r
a₁ = 13 - 2r a₁ = 37 - 6r
Entonces igualamos :
13 - 2r = 37 - 6r
-2r + 6r = 37-13
4r = 24
r = 6
y eso es todo ; espero se entienda xD