What happens when ABC and CBA are the same thing? Learn how to describe and calculate combinations. Explore differences between permutations and combinations in this video.
- When you're giving out three cash prizes … in a raffle, $10, $100, $1,000, the order in which … the three winners are chosen is important. … In those cases, when order is important, … we use permutations, but sometimes order doesn't matter. … In those cases, we use combinations. … Consider this scenario. … Suppose we have 12 students in a class … and one team of four students is going to be chosen … at random to represent the school … at a prestigious competition. … Olivia and Layla are sisters. … They both want to be on the team together, … so what's the probability they will both … get chosen for the team? … To solve this, we'll need to know … how many combinations of four students would be possible. … Combinations are different than permutations. How? … Well, look at these two teams of students. … In both cases, we have the same combination of students. … When we create teams, the order in which we list the names … doesn't change the nature of the team. … So both of these teams actually represent …
Eddie explains that probability is used to make decisions about future outcomes and to understand past outcomes. He covers permutations, combinations, and percentiles, and goes into how to describe and calculate them. Eddie introduces multiple event probabilities and discusses when to add and subtract probabilities. He describes probability trees, Bayes’ Theorem, binomials, and so much more. You can learn to understand your data, prove theories, and save valuable resources—all by understanding the numbers.