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SEGÚN LOS DATOS:
a₅ = 18
a₉ = 34
RESOLVIENDO:
a₁ + 4d = 18 .......................... (I)
a₁ + 8d = 34 .......................... (II)
RESTANDO II - I , SE TIENE:
4d = 16
d = 4
REEMPLAZANDO EN I:
a₁ + 4d = 18
a₁ + 4(4) = 18
a₁ = 2
ESO ES TODO, SALUDOS