How many different ways can objects be organized? Learn how to describe and calculate permutations in this video.
- [Instructor] Probabilities are ratios, … a desired event divided by all the possible outcomes. … For example, the probability of drawing an ace … from a standard deck of 52 cards. … Desired event; draw one of the four aces possible. … Possible outcomes; 52 cards. … Easy, we know there are four aces, … we know there are 52 cards. … But when you're out there all alone in the real world, … sometimes isn't that easy to figure out … what all the possible outcomes are. … That's why it might be helpful to understand … permutations and combinations. … Both attempt to give us every possible outcome. … The difference is that permutations are interested … in the order of things … and combinations are not. … In this video, I'll cover permutations. … For example, the letters A and B … can be arranged in two permutations, … AB, and BA. … How about the numbers, 1, 2, 3? … Here we have six permutations. … But as the number of objects increases, … listing them out becomes more difficult. … Let's try this problem. …
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.