a) Find  4C2. (b) List all of the combinations of {a, b, c, d} when the elements are taken two at a time. (Select all that apply.) {a, d}{b, d}{b, b}{a, a}{c, d}{a, b}{d, e}{b, c}{d, d}{a, e}{a, c}{c, c}

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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a) Find 

4C2.




(b) List all of the combinations of {a, b, c, d} when the elements are taken two at a time. (Select all that apply.)

{a, d}{b, d}{b, b}{a, a}{c, d}{a, b}{d, e}{b, c}{d, d}{a, e}{a, c}{c, c}
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