How many ways can 3 DVDs be selected for playing if they are to be chosen from 6 different DVDs? Order is not important,

i only found for 2 DvDs so here u go

210

÷

2

=

105

Explanation:

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  

15

×

14

choices =  

210

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.

210

2 = 105

i think its b.) groundwater recharge