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## Homework Statement

Find a formula for

[itex]\sum (2i-1)[/itex] =1+3+5+...+(2n-1)

## Homework Equations

## The Attempt at a Solution

[itex]\sum(2i-1)[/itex]=(1+2+3+...+2n)-(2+4+6+...+2n)

=(1+2+3+...+2n)-n(n+1)

I'm unsure what to do with 1+2+3+..+2n ?