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March 28, 2015

Homework Help: statistics

Posted by Katia on Wednesday, June 13, 2012 at 11:53am.

A group of 50 teachers and school administrators attended a convention. If any two persons are picked at random, at least one of the two would be a teacher. From this information, what percentage of the people at the convention were teachers?

Could someone help me start this, or go in the right direction? Or show me another example. I don't know where to start.
Thank you

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