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houstonrockets16
- Junior | Next Rank: 30 Posts
- Posts: 26
- Joined: Mon Feb 02, 2009 4:45 pm
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There are 10 teachers, 4 teach french, and the others teach spanish or german. If you can only selected 3 teacher, how many combinations are there?
[spoiler]the answer is 100, please tell me how and why! thanks so much
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[spoiler]the answer is 100, please tell me how and why! thanks so much
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