Puzzles Forum: Probability tuffy

Probability tuffy

Posted by Denis Borris on 19/9/2009, 10:05 pm

Something to keep Mr McGrath happy!

A bag contains 13 balls numbered 1-13.

7 are drawn out at random.

Now if I select 5 different numbers from 1 to 13, what's the probability
that at least 3 numbers from my selection have been drawn?

Message Thread:

Probability tuffy - Denis Borris 19/9/2009, 10:05 pm
- Re: Probability tuffy - Moby Dick 20/9/2009, 8:28 am
  - agree - markr 20/9/2009, 8:10 pm
    - Re: agree - Denis Borris 21/9/2009, 12:48 am
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