Find 'n'th term — task. Maths CBSE Live product, Class 9 (2026-27).

In a sequence, the sum of the first \(n\) terms is given by \(S_n = \dfrac{n(n+1)}{2} + 4n\). Find the \(20^{\text{th}}\) term.

The \(20^{\text{th}}\) term of the sequence is

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2. Find 'n'th term