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an= a1+ d(n-1)
Se conoce.
a1= 31
d=4
Sustituimos.
an= a1+ d(n-1)
31= a1+ 4(9-1)
a1= 31-32
a1= -1
Se pide el término general.
an= a1+ d(n-1)
an= -1+ 4(n-1)
an= 4n-4-1
an= 4n-5 --> R/.