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\(1\times2+2\times5+3\times8+4\times11+...+n(3n-1)=?\)

Sponsors:

FCT, Ministério da Educação, UP

Created on: 2007

Last update: 2019-09-16 16:10:12+0100

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.