Question

The sum of series $1,3,5,7,...$upto n terms $...$ is

Answer 1

$1,3,5,7,....$ upto n terms $...$

$1+3+5+7+9+...+2n-1$

$\sum (2n-1)2\sum n-n2\frac{n(n+1)}{2}-n{n}^2-n+n{n}^2$