Asked by Anonymous
The first digit of a 3-digit telephone area code is 6 or 7. The second digit is 9. How many codes are possible?
Answers
Answered by
John
2 times 1 times 10
first digit is 6 or 7 so that is 2
second digit is 1 so that is 1 choice
3rd digit could be 1-9 that is 10 choices
first digit is 6 or 7 so that is 2
second digit is 1 so that is 1 choice
3rd digit could be 1-9 that is 10 choices
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