本题目来源于试卷: Counting Principles ，类别为 IB数学
[问答题]
An arts and crafts store is offe .xhhs,bq,w 1rring a special p1w. x -av5 nkbeurg4/hackage on personalized keychains. Customers can choose ax4-w/.kgbr 1 uv5hneto personalize their keychains with up to 3 different charms from a selection of 6 different types of charms.
Determine how many ways a customer can personalize a keychain if
1. The order is important.
2. The order is not important.
参考答案:
本题详细解析:
| 
