60. The International Telecommunications Union (ITU) specifies that a telephone number must consist of a coun-...

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60. The International Telecommunications Union (ITU) specifies that a telephone number must consist of a coun- try code with between 1 and 3 digits, except that the code 0 is not available for use as a country code, followed by a number with at most 15 digits. How many available possible telephone numbers are there that satisfy these restrictions? 60. The International Telecommunications Union (ITU) specifies that a telephone number must consist of a coun- try code with between 1 and 3 digits, except that the code 0 is not available for use as a country code, followed by a number with at most 15 digits. How many available possible telephone numbers are there that satisfy these restrictions?

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To calculate the number of available possible telephone numbers that satisfy the given restrictions ... View the full answer