OCR FP1 2013 January — Question 2

Exam BoardOCR
ModuleFP1 (Further Pure Mathematics 1)
Year2013
SessionJanuary
TopicSequences and Series
2 Find \(\sum _ { r = 1 } ^ { n } ( r - 1 ) ( r + 1 )\), giving your answer in a fully factorised form.
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