Khan Academy: Probability: Probability Using Combinations

Your learners will be surprised by the thought-provoking, counterintuitive puzzle presented in this short video that models a fun, fictional situation in which a game is played with two number cubes to decide which of two people wins a...

Video lesson finding the probability of making at least three out of five free throws by calculating combinations. [10:36]

Video lesson solving for the probability of winning the mega millions jackpot. [5:29]

Video lesson finding the number of possible 9-card hands from a deck of 36 cards by calculating combinations. Gives general formula for combinations. [7:42]

Video lesson introducing probability by exploring different understandings of probability and solving for the probability of simple events. Includes link to additional practice problems. [10:30]

Video defining the addition rule for probability, including finding the probability of mutually exclusive events. [10:43]

Video defining an orthogonal matrix as a square matrix C whose columns form an orthonormal set. Shows that C will be invertible and that multiplying C transpose by C will result in the identity matrix. The result that C transpose equals...

Video demonstrates through several examples how to solve inequalities using multiplication and division of positive and negative numbers. Practice problems available. This video is also found in the strand Algebra: ck12.org. [10:27]

Video shows how to solve and graph inequalities using subtraction or addition. Practice problems available. This video is also found in the strand Algebra: ck12.org. [7:48]

Probability of compound events. The Addition Rule.