Whenever Suzan sees a bag of marbles, she grabs a handful at random. She has seen a bag containing four red marbles, two green ones, fivewhite ones, and one purple one. She grabs five of them. Find the probability of the following event, expressing it as a fraction in lowest terms. She has at most one green one.

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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Whenever Suzan sees a bag of marbles, she grabs a handful at random. She has seen a bag containing four red marbles, two green ones, fivewhite ones, and one purple one. She grabs five of them. Find the probability of the following event, expressing it as a fraction in lowest terms.
She has at most one green one.
Expert Solution
Step 1

The formula for combination is C(n, r) = n! / [r! (n – r)!] = [n (n – 1) … (n – r + 1)] / r!.

Explanation:

Consider that r distinct items need to be selected from n items and the selection must be without replacement. The order of selection does not matter.

In such case, the combination formula can be applied.

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