To calculate the probability of a combination, you will need to consider the number of favorable outcomes over the number of total outcomes. The higher the probability of an event, the more certain that the event will occur. In this online probability calculator, calculate the single and multiple event. Convert A to B odds for winning or losing to probability percentage values for both winning and A:B Odds Probability Calculator Share this Calculation: help. You have an old or no version of flash - you need to upgrade to view this funky content! Edit Related wikiHows WH. Your next lesson will play in 10 seconds. Remember, a combination is a way to calculate events where order does not matter. To learn more, visit our Earning Credit Page. It depends on the range of the random number generator. Now the number of possible outcomes is that for each object, raised to the power of the number of objects. Not Helpful 33 Helpful So, let's say you're trying to find the likelihood of rolling a three on a six-sided die. Not Helpful 6 Helpful That means they both cannot occur at the same time. Not Helpful 2 Helpful 1. Register for a free trial Are you a student or a teacher? Lottery numbers, slots, and roulette wheels are completely random. YOUR ODDS OF WINNING ARE AWFUL! It's easy to convert between probability and odds. Ensure that two events or outcomes must be mutually exclusive.