Considere a P.A. finita, com 15 termos, em que a1=-3 e r=4. Obtenha, nesta P.A. a) o 10º termo.
b) o termo central.
c) o termo geral ou enésimo termo an.
2) Na P.A. (a1, 2, a3, a4, 17,...), encontre:
a) o 1º termo.
b) o termo a18.
c) o termo geral an.
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