Originally Posted by
abracadab Hi,
I'm not a university student (I was, but that was many years ago). Nonetheless, I'm trying to solve a probability puzzle, and this seems like the best place on the Internet to ask for help. The puzzle is as follows:
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N people roll two dice.
After the first roll, half of the people are randomly eliminated, and the
other half get to roll both dice a second time. This continues until all
the people are eliminated. (Thus, N/2 people roll the dice exactly once;
N/4 people roll them exactly twice, N/8 people roll them exactly three
times, etc).
When the process is complete, how many of the N people will have rolled
double sixes at least twice? How many will have rolled double sixes at
least three times?
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Any insights you have would be greatly appreciated. I took probability courses years ago, but I've forgotten a lot of it, and I don't even think that problems like this are anything I ever learned to solve!
Thanks very much.
Abracadab