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You can use Ruby on Rails without actually installing it on your computer.
Hosted development, using a service such as Cloud9, means you get a computer "in the cloud" that you use from your web browser.
This will cause the requested version of Ruby to be downloaded and installed on the system.
The final step is to set this version of Ruby to be the default version of Ruby to use.
Even if you are a student only building new Rails applications, you should be prepared to manage multiple versions of Ruby.