arosh2270 arosh2270
  • 03-05-2018
  • Mathematics
contestada

A phone number contains 7 digits. how many different numbers can be made using the digits 0–9 if the first digit is not 0 and all of the digits can be repeated?

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tristanwil
tristanwil tristanwil
  • 03-05-2018
So since the first number can’t have zero that means it only has 9 options.
The rest of the 6 numbers have 10 options

9*10^6
= 9,000,000
Answer Link
connerjda1 connerjda1
  • 04-05-2018
9x10^6 is your answer.
Answer Link

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