本题目来源于试卷: Counting Principles ，类别为 IB数学
[问答题]
An arts and crafts st6 o ascba khl9 ,-lu2ihag.-el7)nex;ore is offering a special packa maroke*18(fy a4y n ed(*xpx/m+4ir gge on personalized keychains. Customers can choose to personalize their keychains with up to 3 different charms froe1 *4yx/8 xamopr(re4 gf(m+ay i dkn*m 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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