UK telephone area codes vary from 3 to 6 digits in length, depending on the population of the area covered. Big cities such as London have 3 digit codes and long local numbers (e.g. 020 79460018), while smaller towns have shorter local numbers but longer area codes (e.g. 01632 890890).
The town of Doncaster in the UK has the area code 01302. (From overseas, +44-1302)
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It depends on how many digits in an area code. North America (USA, Canada, etc.) uses a uniform system of 3-digit area codes, but many other countries do not. Assuming a 3-digit area code and no other restrictions other than "first digit not zero," that leaves 900 possible area codes.
Any 3 from 10 in any order = 10 x 9 x 8 = 720It depends on what other restrictions you place on the numbers. For example, in North America (country code +1 = USA, Canada, etc.), area codes cannot have 0 or 1 as the first digit, and cannot have 9 as the second digit.
Code 39 is the simplest of alpha-numeric barcodes to use that does not require a check digit to be calculated. Although there is a Mod43 Check digit that is required by standard for LOGMARS and HBIC barcodes. The Code 39 barcode is also known as 3 of 9 Barcode, Code 3 of 9 and Bar Code 39.
3 digit security code on back by signature line.
A US city that has a zip code beginning with the 3 digits of pi is Savannah, GA. Its zipcode is 31411.