The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. How many different phone numbers are possible within an area code?
Ask Question. Asked 7 years, 2 months ago. Active 5 years, 1 month ago. Viewed k times. The tens digit is not double the. The digits in the tens and hundreds place are the least and same value. THe value of the thousands digit is double that of the the thousands digit. How many international direct-dialing numbers are possible if each number consists of a four-digit area code the first digit of which must be nonzero and a five-digit telephone numbers the first digit must be nonzero?
How many different ten digit telephone numbers contain four 2's, three 3s, and three 7s? I tried sorting the numbers out in order 2 2 2 2 3 3 3 7 7 7 10! But I couldn't find the correct solution as the answer was A number has three distinct digits. The sum of the digits equals the product of the digits. How many three-digit numbers satisfy this condition? My ID number is quite remarkable.
Calls for mobile phones will be charged to the caller at a rate determined by their mobile phone carrier. It is an open numbering plan, however, imposing a maximum length of 15 digits to telephone numbers.
Identification Number ————x -1 to 4 digits. Each three-digit area code may contain up to 7,, unique phone numbers: NXX may begin only with the digits [2—9], providing a base of 8 million numbers: 8 x x However, the last two digits of NXX cannot both be 1, to avoid confusion with the N11 codes…. Given this, we do not need to add more decimal places to a telephone number, with ten decimal places we already have ten billion numbers to choose from.
Your email address will not be published. October 3, at pm. There are several other restrictions in place, which bring the total down further. The final figure is probably still around 7 billion total, and less that are actually assignable. Sally says:. September 5, at am. May 6, at am. The solution is usually adding a digit to the prefix rather than suffix. Look at other countries that have run out of numbers such as the UK.
AJ says:. November 5, at pm. Yep, I am believing that the future of voice communications will be slowly transitioned to general server and networking protocols.. Google, skype, and other networking communications is a good example of this taking place. While wireless has become the dominant com source, you can bet our increasingly fried microwave airspace will adapt to not only an optional form of Communication IDs but an increasing default of future communication among people in the U.
0コメント