- The Many Ways the GMAT Tests Ratios
- This tutorial describes how the GMAT can use one concept – ratios – to test you in a number of different ways, from data sufficiency problems dealing with fractions to proportions in a word translation problem.
- Combinatorics and Probability Up Close
- In this tutorial, you learn about combinatorics: a way of counting groups and combinations of objects. You will learn a basic counting method, then progress to a more formulaic method.