This is another educational portal page which will house an ongoing series of documents. The documents here are intended for use when preparing for the mathematics section of the GRE (Graduate Record Exam), though they should also be useful for those studying for the SAT, SAT II (in math), or those simply wishing to review their mathematics.
Each document covers a specific mathematical topic (for example, exponents, fractions, quadrilaterals, or ratios), giving a brief overview and exposition, a list of necessary formulas, special considerations, and numerous worked examples, with solution explanations. All questions are (approximately) at the GRE level, which covers arithmetic, algebra, geometry, counting and probability, all at an undergraduate (general education) level. I hope the documents are of help to those studying out there!
Counting and Probability