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 offering a special package on pe -v8oaxcnuc3 (rsonalized keychap;.cs9;a 4xy yewyit 2ins. Customers can choose to personalize their keychains with up to eyy pw;y. 4tca x92is;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.
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