# How many ways can you buy 2 DVDs from a display of 15?

##### 2 Answers

Aug 8, 2016

#### Answer:

#### Explanation:

We assume that someone will not buy two of the same DVD.

For the first DVD, there is a choice of 15 , but once the first is bought, there is a choice of 14 for the second one.

There are

However, this does not take order into consideration .... the 2 DVD's might be the same, just bought in a different order, so we need to divide this number by 2 to avoid the duplicates.

Aug 8, 2016

#### Answer:

105

#### Explanation:

Assumption: choosing

This is the condition of 'combinations'