http://www.mindbites.com/lesson/5090-perms-combs-combinations-part-i-520 This 53 minute perms & combs lesson is all about combinations and the difference between a combination and a permutation. It really should be called a permutation lock rather than a combination lock! This lesson will show you how to use: - the formula for a permutation - the formula for a combination and to answer questions on: - numbers in lotteries - letters in a word - people on committees - sums of money - selections from objects - cards in a standard deck Sample question: A student council has 10 members, 6 girls & 4 boys. A committee of 6 is chosen to plan for a dance In how many ways can this be done if Mary (one of the 6 girls) must be on the committee? This lesson contains explanations of the concepts and 16 sample questions with step by step solutions plus 6 interactive review questions with solutions. Lessons that will help you with the fundamentals of this lesson include: - 230 Solving Quadratic Equations by Factoring (http://www.mindbites.com/lesson/5087) - 505 Factorial Notation & Linear Permutations (http://www.mindbites.com/lesson/5105)
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