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a₈=3/4
a₉=1
d=a₉-a₈=1-(3/4)=(4-3)/4=1/4.
an=a₁+(n-1).d
si utilizamos el término a₉, para calcular el término a₁, tenemos:
1=a₁+(9-1).(1/4)
1=a₁+8/4
a₁=1-2
a₁=-1
Sol: a₁=-1