The sum of the first $n$ terms of a sequence is given by ${{S}_{n}}=2{{n}^{2}}+n$. Prove that the se

Question

The sum of the first $n$ terms of a sequence is given by ${{S}_{n}}=2{{n}^{2}}+n$. Prove that the series in an arithmetic series and state the common difference.

Accepted Answer

$Arithmetic series with common difference = 4$

Worked Example 1

Worked Example 1

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