Answer
$1+3+...+(2n-1)$
Work Step by Step
$\sum_{k=0}^{n-1} (2k+1)=(2(0)+1)+(2(1)+1)+...+(2(n-1)+1)=1+3+...+(2n-1)$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.