The sum, $S_n$, of the first $n$ terms of the sequence $\{u_n\}$ is given by \[S_n = 2n^2 - 3n

Question

The sum, $S_n$, of the first $n$ terms of the sequence $\{u_n\}$ is given by $$S_n = 2n^2 - 3n, n = 1, 2, 3, \dots$$ Find the sum of the terms from the $10$th term to the $23$rd term of $\{u_n\}$. Find $u_n$ in terms of $n$.

Accepted Answer

(i) $854$ (ii) $u_n=4n-5$

Recovering term from sequence example

Recovering term from sequence example

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