Sequence summation 1 + 3 + 5 +. + (2n-1)

Sequence summation 1 + 3 + 5 +. + (2n-1)

S = 1 + 3 + 5 +. + (2n-1) (n terms)
s=(2n-1)+...+5+3+1
2s = 2n*n
∴ s = 1+3+5+.+(2n-1)=n^2