. C(12,6) ? e. C(8, 4) × C(4, 2) ? f. C(8,4)×C(4,2) / C(12,6) ?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
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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I dont need the answers to the calculations, I need a background scenario for d,e, and f, where the calculation would be the correct answer

a. 12! = arrange 12 balls in a line

b. P(12,5) = 5 balls taken from the total 12

c. 125 = choose 5 balls randomly from 12 balls in a bag with replacement

d. C(12,6) ?

e. C(8, 4) × C(4, 2) ?

f. C(8,4)×C(4,2) / C(12,6) ?

 

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Can you give a background scenario for those questions? i do not need the calculations

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