Undetermined Coefficients (Part 2)

Algebra Level 4

123+234+345++9899100=? 1\cdot 2\cdot 3+2\cdot 3\cdot 4+3\cdot 4\cdot 5+\dots +98\cdot 99\cdot 100 = \, ?


You may want to read the wiki Method of Undetermined Coefficients.
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