Question

Find the progression of which the sum to n terms is (2n + 1)(2n- 1).​

Answer 1

Step-by-step explanation:

(2n+1)

Find the sum of first n terms

Sn= n/2[2a+(n-1) d]

Sn= n/2[2×3+(n-1) 2]

Sn= n/2[ 6+2n-2]

Sn= n/2[4+2n]

Sn= n/2[4+2n]

Sn= 2n+n2

Hence the sum of n terms is NSq +2n

Answer Of

(2n- 1).

Same method

I Hope U Understand