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