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an = a₁ + (n-1) × d
En este caso sabemos:
a₁₂ = 38
n = 12
d = 3 (diferencia)
sustituyendo en la fórmula...
38 = a₁ + (12-1) × 3 ... despejo a₁ ...
a₁ = 38 - 33 = 5
Saludos.