GMAT Probability

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

  • Finding probabilities by counting
  • Complements
  • “At least” & “at most” questions
  • “Or” probabilities
  • “And” probabilities
  • Mutually exclusive events
  • Independent events

 

GMAT PROBABILITY VIDEOS

  • 1. Lesson: Introduction to Probability (6:42)
  • 2. Question: Sum of 11 (2:35)
  • 3. Lesson: The Complement (6:06)
  • 4. Question: At Least 1 Even Number (3:39)
  • 5. Lesson: Mutually Exclusive Events (3:21)
  • 6. Lesson: Probability of Event A OR Event B (4:54)
  • 7. Lesson: Applying the OR Rule (2:17)
  • 8. Question: Red or Green Ball (3:06)
  • 9. Lesson: Probability of Event A AND Event B (3:16)
  • 10. Question: 2nd Ball is Yellow (2:35)
  • 11. Lesson: Independent Events (6:25)
  • 12. Lesson: Determining Independence (3:52)
  • 13. Lesson: Rewriting Questions (5:33)
  • 14. Question: Total Number of Balls (2:47)
  • 15. Lesson: Listing vs Counting vs Probability Rules (7:40)
  • 16. Lesson: General GMAT Probability Strategies (2:03)
  • 17. Lesson: Guessing Strategies (5:31)
  • 18. Question: Green Ball (2:24)
  • 19. Question: Target (2:04)
  • 20. Question: Yellow Ball or Red Ball (2:13)
  • 21. Question: Same Color (3:02)
  • 22. Question: 2 heads (4:02)
  • 23. Question: Socks (4:40)
Total viewing time for the GMAT Probability module: 91 minutes.

Additional Practice

Each of the above video lessons features a Reinforcement Activities box containing practice questions that are specifically related to the particular concepts covered in that lesson (e.g., the lesson on The Complement). On the other hand, the links below will take you to practice questions that test a wide variety of questions under the general topic of Probability. Given this, you may find it beneficial to work on the questions below AFTER you’ve mastered the content in the Probability module above.

- Official GMAT questions about Probability- Problem Solving

- Official GMAT questions about Probability - Data Sufficiency

 

Practice from the Official Guide

Official Guide for GMAT Review (2019 edition)

Problem Solving: 27, 142, 162, 170, 221

Data Sufficiency: 245, 277, 305, 309

Official Guide for GMAT Review (2018 edition)

Problem Solving: 11, 142, 162, 170, 221

Data Sufficiency: 236, 297, 302

Official Guide for GMAT Review (2017 edition)

Problem Solving: 11, 123, 146, 154, 194, 221

Data Sufficiency: 236, 283, 287

Official Guide for GMAT Review (2016 edition)

Problem Solving: 8, 80, 129, 136, 202, 219   

Data Sufficiency: 7, 50, 140

Official Guide for GMAT Review (2015/13th edition)

Problem Solving: 10, 68, 107, 173, 193, 215

Data Sufficiency: 3, 39, 125

 

While answering practice questions from the Official Guide for GMAT Review (2019, 2018, 2017, 2016 or 2015), you can enter your responses directly into our downloadable Improvement Chart. This will help track your progress and identify areas of weakness.

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