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math

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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 - ,

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

  • math - ,

    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 - ,

    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 - ,

    its 1/210

  • math - ,

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

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