SOLUTION: There are four batteries, and one is defective. Two are to be selected at random for use on a particular day. Find the probability that the second battery selected is not defective

Question 1179596: There are four batteries, and one is defective. Two are to be selected at random for use on a particular day. Find the probability that the second battery selected is not defective, given that the first was not defective.
Answer by ikleyn(52811) (Show Source): You can put this solution on YOUR website!
.
There are four batteries, and one is defective. Two are to be selected at random
for use on a particular day. Find the probability that the second battery selected is not defective,
given that the first was not defective.
~~~~~~~~~~~~

Originally, we have 4 batteries, of which one is defective and three are good.


Given that the first selected battery is good, leaves us 3 batteries to chose from, 

of which one is defective and two others are good.


The probability to select the 2nd battery good is  P = .     ANSWER

Solved, answered and explained.

Do not forget to post your "THANKS" to me for my teaching (!)

RELATED QUESTIONS
There are four batteries, and one of them is defective. Two are to be selected at random (answered by Edwin McCravy)

There are two defective batteries in one package of six batteries and three defective... (answered by Theo)

Suppose that an automobile parts wholesaler claims that .5 percent of the car batteries... (answered by ewatrrr)

In a box of thrity aaa batteries there are three defective batteries. Two batteries are... (answered by katealdridge,stanbon)

There are 1000 components in a box of which 10 are known to be defective. two... (answered by Edwin McCravy)

A box contains 42 batteries, 7 of which are defective. If 5 are selected at random, find... (answered by stanbon)

A bag contains eight batteries, all of which are the same size and are equally likely to... (answered by stanbon)

A flashlight has eight batteries, three of which are defective. If two different... (answered by Boreal)

A flashlight has eight batteries, three of which are defective. If two different... (answered by greenestamps)