Hey I am a brilliant user since Jan 2013. How can I access previous problems and their respective solutions of december, november ... 2012.
4 years, 7 months ago
You can only access problems and solutions that you have worked on.
Some of the older problems may be reused in upcoming sets, so that new users can get a look at them.
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I had the same question. I wanted to also access problems I solved at easier levels so I can send them to my students.
You can review the problems that you have worked on in the past under the solutions tab.
You can share these problems using the "Share this problem" link located at the bottom. Your students will see the problem (without the numerical answer nor the solution) so that they can work on it.
What solutions tab?
How can you post solutions?
As stated in the FAQ,
"If you get a problem correct you may randomly be asked to submit a solution for extra points."