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 offljbd5,1h7 1sp .p 5, vsuakgwuering a special package on personalized keyj: xc9hk:( vknbnzx ;0chains. Customers can choose to personalize their keychains with up to 3 different charms from a selection of 6 differ(kk:x vx:j;cz9nh 0b nent 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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