Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

A tough one

  1. Oct 22, 2007 #1
    A family of five people randomly picks a name of a family member from a hat to decide for whom to buy a present.
    What is the probability that nobody picks their own name?
    If someone picks their own name, all the names are returned and everyone picks again. What is the probability that it took exactly two tries for everyone to pick a name of another family member:confused:
  2. jcsd
  3. Oct 22, 2007 #2


    User Avatar
    Science Advisor
    Homework Helper

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: A tough one