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Zero in pin code
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JimmyTheWig
Posts: 12,199 Forumite
Martin (I believe) wrote this on Twitter...
I'm not on Twitter, but wanted to give the answer of 1 in 3439.
The pin could be one of
0[0-9][0-9][0-9]
[1-9]0[0-9][0-9]
[1-9][1-9]0[0-9]
[1-9][1-9][1-9]0
The first of these has 1000 options.
The second has 900 options.
The third has 810 options.
The fourth has 729 options.
[If he said that exactly one of his digits is zero then the odds of guessing it would be 1 in 2916.]
A friend just revealed one of his pin numbers is a 0. Am too tired to work out what my odds of correctly guessing it are now.
I'm not on Twitter, but wanted to give the answer of 1 in 3439.
The pin could be one of
0[0-9][0-9][0-9]
[1-9]0[0-9][0-9]
[1-9][1-9]0[0-9]
[1-9][1-9][1-9]0
The first of these has 1000 options.
The second has 900 options.
The third has 810 options.
The fourth has 729 options.
[If he said that exactly one of his digits is zero then the odds of guessing it would be 1 in 2916.]
0
Comments
-
Guessing PIN codes is really quite hard - at least in normal circumstance.
Even if I told you my first two digits were 00, you have 100 combinations to check. Three would get you blocked from an ATM, so you'd be running about for a while...Said Aristippus, “If you would learn to be subservient to the king you would not have to live on lentils.”
Said Diogenes, “Learn to live on lentils and you will not have to be subservient to the king.”[FONT=Verdana, Arial, Helvetica][/FONT]0 -
You need a bit more social engineering. If he's a trekkie, try 1701?0
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