If the sum of n terms of a sequence is given bySn=n2+4n+1
then the nth term of the sequence is given by
2n+3
2n + 4
2n+5
2n+1
The nth term of the sequence is given bySn−S(n−1)=2n+3
If the nth term of the sequence is given by (n2−1)(n+1) , then the sum of first n terms of the sequence is given by