What are the chances...?

2 in 1000, 1 in 500?

2 guesses out of 10,000 doesnt mean he's halved his odds of getting the next guess right.

Just means 1 in 9,999 on his 2nd go, and 1 in 9998 on his third go.



If like you say, his odds of guessing the pin are halved on his 2nd guess. That means he's wiped out 5,000 combinations in one guess?

Doesnt make sense to me!
 
Step aside.


The chances were in fact 1 in 1, taking in all information in the universe, the outcome of the 2nd guess could have been predicted.

/pedant
/thread
 
The actual odds of that scenario happening are 1/10000
9999/10000 for the first attempt (probability of getting it wrong), then 1/9999 for the second (assuming you know to discount the first set of digits)

Multiply them together to get your probability of the overall event.
 
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