http://www.educajob.com/xmoned/temarios_elaborados/matematicas/tema08.pdf
http://www.guiamath.net/ejercicios_resueltos/01_04_04_10-Progresiones_Armonicas/0_Progresiones_Armonicas.html
clarito Example:
2,5,8,11,14 ,..., 3n -1 is an arithmetic progression.
1 / 2, 1 / 5, 1 / 8, 1 / 11, 1 / 14 ,..., 1 / (3n-1) is a PH.
León-Sotelo.
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