1.

N² +2n is the algebraic expression for sum of n termsof an arithmetic sequence when find the nth term of that sequence​

Answer»

Step-by-step EXPLANATION:

Sn=N/2(2a-d+nd)=n²+2n

n/2(2a-d+nd)=n(n+2)

2a-d+nd=2n+4

nd=2n......... d=2

2a-d=4

2a=6........ a=3

Tn=a+nd-d=3+3n-2=3n+1



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