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OlgaM077 [116]
3 years ago
10

A seven-digit phone number in the united states consists of a three-digit exchange followed by a four-digit number.

Mathematics
1 answer:
Sloan [31]3 years ago
7 0
10 total numbers can be used for each digit ( 0-9) except the first digit:

 1st digit can be 1 of 9 numbers
other 6 digits can be 1 of 10 numbers each

multiply all the possible numbers together:

9 x 10 x 10 x 10 x 10 x 10 x 10  = 9,000,000 possible phone numbers

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