Presidential Probability Puzzle Simulator

Is the probability 1/2 (50%) or 2/3 (66.7%)?

• Given:
  • Six president names are hidden in three identical boxes
    • Three Democrat and three Republican names are randomized every round
    • One box will always contain two Democratic names
    • One box will always contain two Republican names
    • One box will always contain names from both parties
• Given:
  • You have already picked one box at random
  • You have already drawn out one name, and it is a Democrat
  • What are the odds that the second name will also be a Democrat?
• Calculate: P (D | D )
  • Given that you know the first name is a Democrat ...
  • What is the probability that the second name is also a Democrat?
• Try to estimate the probability for yourself:
  • 1/2 or 50%
  • 2/3 or 67%
  • What do you think?
• Click here to simulate the Presidential Probability Puzzle.

* Send improvement suggestions to John at domain mazes,com

I need some free PHP advice.

Do you know PHP? I need help coding a simple Input/Output on Server to keep track of grand total of everyone's trials.

1. Delay if file tags say another client is updating file
2. But continue anyway if delay is too long
3. Tag file so other clients know file is being updated
4. Open file, read four numbers as regular Comma delimited text
5. Increment some of those values
6. Write updated numbers back to beginning of file
7. Close file
8. Untag file so next client knows file is available
   * * If you have free advice, I'd love to add global totals to this program.