[quote=StatMeister]The chances your PIN is a 1111, 2222, 1234 ... sequence, or its simply your birth year . . . is 40%.

If I stole 10 ATM cards, I could guess at least 1 correctly with only 3 tries!

http://www.datagenetics....ptember32012/index.html[/quote]
but you do not know any other detail. Not much helpful

[quote=StatMeister]The chances your PIN is a 1111, 2222, 1234 ... sequence, or its simply your birth year . . . is 40%.

If I stole 10 ATM cards, I could guess at least 1 correctly with only 3 tries!

http://www.datagenetics....ptember32012/index.html[/quote]

40% is not true!!! This is the reason...

From the little mathematics that i remember i will prove this fallacy through Permutations (picking and filling the numbers in the PIN No. fields from 10 digits that is 0-9)

With repetition

If the PIN No has 4 digits, the first digit field can be occupied by 10 digits...in other words there are 10 possibilities for the first choice...10 possibilities for the second choice and so are the third and fourth...

so you can choose four digits from a pack of 10 in 10 x 10 x 10 x 10 ways without any order..

this is 10,000 permutations or ways. so far so good.

The trouble is, only one 4 digit combination is correct

The probability of getting this correct combination of digits that make up the PIN No. is 1/10,000 = 0.00001...toll order!!