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# Archive | Permutations and Combinations

## GMAT Counting with Restrictions

First, try these challenging GMAT Quantitative problems, all variations on a theme, as you will see. 1) Seven children — A, B, C, D, E, F, and G — are going to sit in seven chairs in a row.  The children C & F have to sit next to each other, and the others can […]

## GMAT Math: Calculating Combinations

First, a few practice questions.  Remember — no calculator! 1) A radio station has to choose three days of the seven in a week to broadcast a certain program, and that set will repeat each week.  The program can be broadcast equally on any of the seven weekdays —- weekdays vs. weekends don’t matter at […]

## Breakdown of GMAT Quant Concepts by Frequency

Magoosh’s very own Mike McGarry, GMAT/Math Teacher/Tutor/Foosball player extraordinaire, went through 5 different sets of Official GMAT Practice Material and tallied questions based on the subject material they tested to find the most common GMAT questions. Here are the samples of Official Material he used to figure out the GMAT Quant breakdown: 1.GMAT Official Guide […]

## GMAT Permutations and Combinations

Permutations A permutation is a possible order in which to put a set of objects.  Suppose I had a shelf of 5 different books, and I wanted to know: in how many different orders can I put these 5 books?  Another way to say that is: 5 books have how many different permutations? In order […]