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The local seven digit telephone numbers in city A have 207 as the first three digits. How many different telephone numbers are possible in City A?

User Ohduran
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Given:

There are seven total digits.

The first 3 are already selected, so there is a choice for 4 digits.

There are 10 possible choices for each of the other 4 digits, so there are a total of 10×10×10×10 choices. Therefore:


10*10*10*10=10000

Answer: 10000

User WolfmanDragon
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