While on vacation, Sandra wants to buy 2 wallets. There are 7 different patterns she can choose from. In how many ways can Sandra choose 2 different wallets?
1 Answer
Nov 23, 2017
Explanation:
*if she can buy two of the same pattern
to make it simple let's say there are only 3 pattern
ABC the options should be
1. aa
2. bb
3. cc
4. ab
5. ac
6. ba
7. bc
8. ca
9. cb
