SOLUTION: Let the world telecommunication body decides to follow the norm to assign a number. The country code is made up of digits 0 to 9 that do not repeat. How many country codes can be

Question 785284: Let the world telecommunication body decides to follow the norm to assign a number.
The country code is made up of digits 0 to 9 that do not repeat.
How many country codes can be generated?
There are 273 countries on the globe at present. Do you have any logical suggestion to use up all options and make the coding the as effectively used as possible?
The area code is made up of digits 0 to 9 that do not repeat.
How many area codes can be generated?
There are 50 states in US; 22 provinces, 7 regions and 4 municipalities in China and 28 states, 6 union territories and Delhi are in India.
Do you have any logical suggestion to use up all options and make the coding the as effectively used as possible?
The sub-area code uses 3 digit number, with or without repetition.
The special code uses digits on phone dial code for ease to remember. For example, a TAXI company can have these digits as 8294.
Do you have any logical suggestion for two or more 4 letter words having the same number code?
How many 7 digit codes are possible?

Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
How many 7 digit codes are possible? 10^7
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