http://www.mindbites.com/lesson/5105-perms-combs-factorial-linear-permutation-505 This 66 minute perms & combs lesson introduces and works with factorial notation by simplifying expressions and solving equations with factorials. This lesson also includes the definition and formula for a permutation. This lesson will show you how to: - answer questions using factorial notation - use the permutation formula for questions with no restrictions Sample questions: 1. Solve for n. (n+1)!/(n-1)! = 90 2. Some motorcycle license plates consist of 2 different letters, followed by 3 different digits. How many license plates are possible? This lesson contains explanations of the concepts and 22 example questions with step by step solutions plus 10 interactive review questions with solutions. Lessons that will help you with the fundamentals of this lesson include: - 135 Solving Linear Equations Part I (http://www.mindbites.com/lesson/5068) - 230 Solving Quadratic Equations by Factoring (http://www.mindbites.com/lesson/5087) - 500 the Fundamental Counting Principle (http://www.mindbites.com/lesson/5104)
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