Solve - -nr-1 2r-12r-1

[ ∑ #160; _ r=1 ^ n ( 2r 1 ) ( 2r+1 ) #160;; ...

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Factorisation by Regrouping Terms

Solve : Σnr...

Question

Solve : $Σ_{r = 1}^{n} (2 r - 1) (2 r + 1)$

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Solution

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