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Arithmetic Mean and Averages

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Multiple Choice

The $A.M.$ of the observations $1.3.5,3.5,7,9,.,(2n-1)(2n+1) (2n+3)$ is $(\forall\ n\ \in\ N)$

  1. $2n^{3}+6n^{2}+7n-2$
  2. $n^{3}+8n^{2}+7n-2$
  3. $2n^{3}+5n^{2}+6n-2$
  4. $2n^{3}+8n^{2}+7n-2$
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