The sum of its n terms of an ap is 4n - n sq.
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Sn=4n-n^2
S(n-1)=4 (n-1)-(n-1)^2=4n-4-n^2+2n-1
we know
tn=Sn-S (n-1)
=4n-n^2-4n+4+n^2-2n+1
=5-2n
hence
AP 's nth term is 5-2n
3,1,-1-3.......
S(n-1)=4 (n-1)-(n-1)^2=4n-4-n^2+2n-1
we know
tn=Sn-S (n-1)
=4n-n^2-4n+4+n^2-2n+1
=5-2n
hence
AP 's nth term is 5-2n
3,1,-1-3.......
abhi178:
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