Permutations with Restrictions

Permutations with Restrictions

By: Rich Zwelling, Apex GMAT Instructor Date: 2nd March, 2021 So far, we’ve covered the basics of GMAT combinatorics, the difference between permutations and combinations, some basic permutation and combination math, and permutations with repeat elements. Now, we’ll...
Triangle Inequality Rule

Triangle Inequality Rule

One of the less-common but still need-to-know rules tested on the GMAT is the “triangle inequality” rule, which allows you to draw conclusions about the length of the third side of a triangle given information about the lengths of the other two sides. Often times,...
45-45-90 Right Triangle – GMAT Geometry Guide

45-45-90 Right Triangle – GMAT Geometry Guide

By: Rich Zwelling, Apex GMAT Instructor Date: 6th January, 2021 45-45-90 Right Triangle Another of the commonly tested triangles on the GMAT is the 45-45-90, also known as the isosceles right triangle. Know that term, as it could appear by name in a question. As shown...
GMAT vs GRE

GMAT vs GRE

If you’re on the verge of pursuing a professional career in business administration, finance, marketing, marketing management, accounting, law, etc. then taking the GMAT or GRE will be a detour along the way to the top. The type of exam you choose matters. There’s a...