# Two balls are drawn from a bag containing 5 white and 7 black balls at random. What is the probability that they would be of different colours?

##### 2 Answers

Nov 13, 2017

#### Answer:

If the first ball is replaced:

If the first ball is not replaced:

#### Explanation:

There are

- both are white
- both are black
- one of each color

The probability of one of each color is

If the first ball is replaced:

However, if the first ball is NOT replaced, the probability changes for the second ball. There are fewer of one color and one ball less.