In this module, you'll learn all of the concepts, techniques and strategies needed to answer counting questions on the GRE. In particular, this module covers:

 The Fundamental Counting Principle Factorial notation Handling restrictions “At least” & “at most” questions The MISSISSIPPI rule Combination questions Permutation-type questions

### Two ways to prepare

Beneath most of the video lessons below, you’ll find a Reinforcement Activities box containing practice questions that are specifically related to the concepts covered in that lesson (e.g., the lesson on the Fundamental Counting Principle). With this lesson format, you have two study options:

• Watch the video lesson first and then reinforce your learning by answering several related questions, or…
• Tackle the practice questions first and watch the lesson only if you need help with the concepts the practice questions test

For more on this learning strategy, read the “How to Beat the GRE” section of our course overview page.

## GRE COUNTING VIDEOS

• 1. Lesson: Listing and Counting (3:53)
• 2. Question: Distributing Coins (2:19)
• 3. Lesson: The Fundamental Counting Principle (4:48)
• 4. Lesson: Fundamental Counting Principle Example (3:18)
• 5. Lesson: Counting Strategies - Part I (0:56)
• 6. Question: 3-Digit Odd Numbers (1:55)
• 7. Question: Test Answers (1:49)
• 8. Lesson: Factorial Notation (3:19)
• 9. Question: Math with Factorials (0:31)
• 10. Question: Books on a Shelf (2:29)
• 11. Lesson: Handling Restrictions (5:12)
• 12. Question: Numbers with at Least One 7 (4:12)
• 13. Lesson: MISSISSIPPI Rule (3:10)
• 14. Question: Number of Routes (2:15)
• 15. Lesson: Introduction to Combinations (4:25)
• 16. Lesson: When to use Combinations (8:15)
• 17. Lesson: Calculating Combinations (4:46)
• 18. Question: Committee of 4 people (2:26)
• 19. Lesson: Counting Strategies - Part II (1:50)
• 20. Question: Arranging Buttons (1:17)
• 21. Question: Evening Out (1:02)
• 22. Question: Bicycle with Optional Features (3:43)
• 23. Question: Committee of 2 Men & 2 Women (2:44)
• 24. Question: 2 Repeated Digits (3:11)
• 25. Question: Committees without R and S (3:30)
• 26. Question: Product Codes (4:08)
• 27. Question: Choose R Employees (2:12)
Total viewing time for the GRE Counting module: 84 minutes.

## Practice from the Official Guide

Practice the skills and GRE-specific strategies you learned in this module by answering the following questions from the Official Guide to the GRE (3rd edition):

• 167(7), 320(6), 321(7-10)

Here are the related questions in the Official Guide to the GRE (1st or 2nd edition):

• 157(7), 297(6-10)

Note: The above practice questions are listed in the form page#(question#). So, for example, 157(7) represents question #7 on page 157.