GMAT Probability Tip

For many GMAT probability questions, you can apply the basic probability formula or you can apply the various probability rules. So, be sure to consider your options before going ahead with one approach.

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In the GMAT Probability module, you will learn all of the concepts, techniques and strategies needed to answer probabilityquestions on the GMAT. In particular, the GMAT Probability module covers the following topics:

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

Additional Practice

Problem Solving (level of difficulty: 350 to 500)

Sum of 9

Most likely interval

Sets M and T

5 coin flips

10 envelopes

Problem Solving (level of difficulty: 500 to 650)

120 marbles

Rosebushes

Six coin flips

Dice game

Juniors and seniors

Three coin tosses

Business school siblings

4 fair dice

Problem Solving (level of difficulty: 650 to 800)

2 girls and 2 boys

Random bouquet

Four expressions

Andrew and Karen

Matching socks

Littermates

Data Sufficiency (level of difficulty: 650 to 800)

Leila at carnival

Selecting representatives

Red ball vs white ball

White or even number

 

Practice from the Official Guide

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

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

Data Sufficiency: 3, 39, 125

Official Guide for GMAT Quantitative Review (2nd edition)

Problem Solving: 79, 160

Data Sufficiency: 122
 

Track your progress by entering answers directly into our free, downloadable GMAT Prep Now Improvement Chart for the Official Guide (2015 edition or 13th edition)