If the sum of the first n terms of an AP is `4n-n^2`, what is the first term (that is `S_1`)? What is the sum of first two terms? What is the second term? Similarly, find the 3rd, the 10th and the nth terms.

Explanation

Here, a is the first term, d is the common difference and n is the number of terms and l is the last term.


Given,


Sum of first n terms, `S_n = 4n - n^2`


Therefore,


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