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Posted by on Friday, November 2, 2012 at 11:45am.

Suppose there are 21 students in your class. If the teacher draws 2 names at random, what is the probability that you and your best friend will be chosen?

2/21
1/20
1/105
2/10

  • math - , Friday, November 2, 2012 at 2:30pm

    A specific two names out of 21? What do you think?

  • math - , Friday, November 1, 2013 at 11:40am

    Mine had different possible answers, mine was 1/210. I'm not sure how it got there but that's what it was. Sorry i prob didn't help much.

  • math - , Thursday, February 27, 2014 at 12:25pm

    I ran into the exact same problem. PsyDAG was wrong because by taking out either you or your friend. That means there are less people, changing the possibility for the one left behind. The answer is 2/10 i think.

  • math - , Monday, January 25, 2016 at 1:27pm

    its 1/210

  • math - , Tuesday, February 23, 2016 at 11:12am

    Its 1 1/210 I just answered it on switched on schoolhouse, Hope this helps!!! (:

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