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Arithmetic Mean and Averages
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The $A.M.$ of the observations $1.3.5,3.5,7,9,.,(2n-1)(2n+1) (2n+3)$ is $(\forall\ n\ \in\ N)$
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A
$2n^{3}+8n^{2}+7n-2$
💡 Explanation:
The arithmetic mean of a sequence is the sum of terms divided by the number of terms. For the given series, calculating the sum and dividing by n yields the expression in option D.