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Textbook Selection How many different ways can an instructor select 2 textbooks from a possible 17?
136
Intro Stats / AP Statistics
Chapter 4
Probability and Counting Rules
Section 4
Counting Rules
Sampling and Data
Probability Topics
Missouri State University
University of North Carolina at Chapel Hill
Piedmont College
Boston College
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in this problem and in sport has to select two books off 17 books. This can be we conducted as in an expression 17. See to, uh, you all know that combination rule that is and C are equal toe in factorial. Do you read it? But in minus R factorial into our factory here and is 17 so 17 factorial divided by and minus R factorial is 17 minus two. Factorial neutered by art, is defacto dead. We converted as 17 factorial 70 into 16 in 2 15 back factory because when we simplify 17 minus two, we will get 15 factory. It's easy to simplify that. Oh, both numerator and denominator into two factory. Now we will cancel 15 factorial in both numerator and denominator will get 17 into 16 divided by two factorial is do into one 1 36 vase Are there to select books
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