Here We are considering that you have already created the svn repository.
Below is the command to start the svn server. Once the svn server started only we can access the repository.
SVN Command Syntax:
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svnserve -d -r REPO_PATH
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If svn repository created in D:/SVN_REPO, then you have to run the below command
SVN Command Example:
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svnserve -d -r "D:/SVN_REPO"
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Feel free to post your comments and queries.