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Combinations of ' pin ' numbers.

llamekuf | 18:18 Fri 22nd May 2009 | Quizzes & Puzzles

8 Answers

Each pin is usually 4 numbers.
Can anyone tell me how many combinations there would be from the 4 numbers.
thanks.

dm 22/5

dm13459

Answers

1 to 8 of 8

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grasscarp

If the first four-digit number is 1000, then there are 9000 possible four-digit numbers.

Of you can have a zero as a first digit then there are 10000 possibilities.

Minoru

A tip for travelling abroad Do not have a zero in your pin number for any card likely to be used for cash in Europe. Some countries' dispensers do not recognise zero as a number.

Minoru

A tip for travelling abroad Do not have a zero in your pin number for any card likely to be used for cash in Europe. Some countries' dispensers do not recognise zero as a number.

Minoru

Pin numbers A tip for travelling abroad Do not have a zero in your pin number for any card likely to be used for cash in Europe. Some countries' dispensers do not recognise zero as a number.

llamekuf

Question Author

Thanks grasscarp but surely as there are millions of accounts in the UK there would need to be more than 100000 combinations even if obviously we may have the same pin as someone else.

Mailmutt

We might well have, but the card is ID'd by other info too.

TCL-MUMPING

While there are millions of accounts, there is only one PIN per card. The PIN is used to indicate the person using the card is authorized to use it and a four-digit number is used to reduce the risk of it being guessed by chance.

TCL-MUMPING

Another way to look at it is this. Imagine if there were billions of unique First names and only 9,000 surnames and each person's surname was known only to that person and their bank. You and I may know each other's First name but unless I correctly guessed yir surname, I'd not be able to withdraw money from the bank. That's how the PIN works, the account number is the First name and the PIN is the surname.

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