1.

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

Answer»


ANSWER :`S_(1) =3, S_(2) =4; a_(2)=1; a_(3)=-1, a_(10)= -15`
`a_(N) \ 5-2n`


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