If the sum of the first \( n \) terms of an AP is \( 4 n-n^{2} \), what is the first term (that ...

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If the sum of the first \( n \) terms of an AP is \( 4 n-n^{2} \), what is the first term (that is \( \mathrm{S}_{1} \) )? What is the sum of first two terms? What is the second term? Similarly, find the 3rd, the 10th and the \( n \)th terms.
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