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

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

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connerjda1 connerjda1

04-05-2018

9x10^6 is your answer.

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