A golf ball is selected at random from a golf bag. If the golf bag contains 3   green   ​balls, 8   orange   ​balls, and 4   yellow   ​balls, find the probability of the following event.   The golf ball is green   or orange . The probability that the golf ball is green   or orange   is nothing . ​(Type an integer or a decimal rounded to three decimal places as​ needed.)

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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A golf ball is selected at random from a golf bag. If the golf bag contains

3
 
green
 

​balls,

8
 
orange
 

​balls, and

4
 
yellow
 
​balls, find the probability of the following event.
 
The golf ball is
green
 

or

orange
.
The probability that the golf ball is
green
 

or

orange
 

is

nothing
.
​(Type an integer or a decimal rounded to three decimal places as​ needed.)
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