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great question need help!

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by houstonrockets16 » Sun Jun 28, 2009 10:58 pm
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
[/spoiler]
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Source: — Problem Solving |
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by shanmugam.d » Sun Jun 28, 2009 11:47 pm
https://www.beatthegmat.com/my-gmat-is-i ... 39654.html
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by pops » Mon Jun 29, 2009 12:23 am
actually the question posted here is incomplete as it is missing "at least one must teach french"
in that case the question is to select 3 teachers from 10 which is
10C3 = 120

otherwise if at least one french teacher is to be selected then the above solution is perfect :-)
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by shanmugam.d » Mon Jun 29, 2009 1:21 am
I think the question is missing that part. because i feel i had come across this question
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