1.

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 .

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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