You have posted it in the wrong section. For better advice post your query in the GMAT Strategy section. Or maybe some moderator can move this thread to that section.
But to answer your question: Try the Manhattan GMAT's Word translation book. you can go to a barnes and noble or a library and read it. If you like it i recommend you to buy as it will help you with other sections also.
Also here are some links that might help you:
https://www.manhattangmat.com/strategy-s ... bility.cfm
https://www.mansw.nsw.edu.au/members/ref ... no4yen.htm
https://library.thinkquest.org/20991/alg2/prob.html
https://www.andrews.edu/~calkins/math/we ... prod02.htm
But i suggest you not spend too much time of this because the maximum you are going to come across on this topic is 2 problems... my opinion!!
probability????
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