Use the formula for "Cr to solve Exercises 49-56. Of I 2 possible books, you plan to
Chapter 8, Problem 51(choose chapter or problem)
Use the formula for "Cr to solve Exercises 49-56. Of I 2 possible books, you plan to take 4 with you o n vac-.Jtion. How many different collections of 4 books can you take?
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