The probability of an event is a number between 0 and 1 that describes the likelihood that the event will occur. Events can also be called outcomes or possibilities.
Probability can be given as a fraction (2/5), a ratio (2 in 5) or a percent (40%).
Probability is one of the most common causes of student questions about the GMAT quantitative section. Learn formulas and strategies from an expert Kaplan GMAT teacher, and ace any probability questions you encounter on Test Day!
Probability is often seen as a very difficult part of the GMAT, but by logically applying one simple fraction you can make probability much easier. Start with probability in its most basic form.
You have a fair six-sided die. If you roll it once, what is the probability you roll a 5?
There are 6 sides to the die, and each is equally likely to come up. So there are 6 possible outcomes, and rolling a 5 is the one that you want. Therefore, there is a 1 in 6 probability that the 5 will come up. (Note: die is the singular of dice.)