Question 491062: A bag contains a total of 20 batteries, of which four are defective. Selecting two at random, without replacement, determine the probability that none of the batteries you select are good.
1. 3/95
2. 3/5
3. 1/5
4. 4/95
Which one should it be? Can I have help, please?
Answer by Edwin McCravy(20061)   (Show Source):
You can put this solution on YOUR website! A bag contains a total of 20 batteries, of which four are defective. Selecting two at random, without replacement, determine the probability that none of the batteries you select are good.
The sample set is the ways to choose any 2 out of the 20, or
These:
16 good ones, choose 2, or 16C2,
out of these:
20 batteries choose 2 or 20C2
Answer: 
Edwin
|
|
|
