This video covers the multiplication rule for probability which is used in "and" problems, such as the probability of rolling two dice and getting a 5 "and" a 6, or flipping two coins and getting a head "and" a tails. (As the name implies, multiplication is involved.)

5% Fudge Rule for Multiplication Rule

This is a quick video explaining when you're allowed to sort of pretend that dependent events -- such as drawings "without replacement" -- are "close enough" to independent that you can do the math as if they're independent. Hint: the cutoff is around 5 percent.

Hybrid Multiplication & Addition Rule Problems

Often in probability word problems, you're going to need a combination of these two rules because outcome probabilities that you calculate with the multiplication rule have to be added up to get the overall probability of a compound event. Things like rolling even numbers in dice, or flipping some combination of heads and tails.

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If you do not have an account, you should get one, because it is awesome! You can save a playlist for each test or each chapter, and save your "greatest hits" into a "watch right before the final" list (not that we recommend cramming, but when in Rome...)