Answer :
difference = 3,5,7,9,11...
2nd difference = 2
difference = (2n+1)
gradient = 2n
integral of 2n = n^2.
n^2 = 1,4,9...
n^2 - 1
2nd difference = 2
difference = (2n+1)
gradient = 2n
integral of 2n = n^2.
n^2 = 1,4,9...
n^2 - 1
