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2, 5, 8, 11...
+3 +3 +3
t₁ = 2
r = 3
Utilizar: tₓ = t₁ + (x - 1)r
tₓ = 2 + (x - 1)(3)
tₓ = 2 + 3x - 3
tₓ = 3x - 1
t₁₀ = 3(10) - 1
t₁₀ = 30 - 1
t₁₀ = 29