Two good probability cheat sheets (not primers, though) are http://matthias.vallentin.net/blog/2010/10/probability-and-statistics-cheat-sheet/ http://matthias.

Two good probability cheat sheets (not primers, though) are http://matthias.vallentin.net/blog/2010/10/probability-and-statistics-cheat-sheet/ http://matthias.vallentin.net/blog/2010/10/probability-and-s... https://github.com/wzchen/probability_cheatsheet https://github.com/wzchen/probability_cheatsheet