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A telephone number consists of seven digits, the first three representing the exchange. how many different telephone numbers are possible within the 537 exchange g

User Cwoebker
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1 Answer

3 votes
we have that

1) Subtract 3 from 7, because the exchange is always the same.
that leaves 4 numbers
the number of possible digits in each number is 10
therefore
possibilities=10*10*10*10=10000 numbers

the answer is 10000

User Dalton
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