Assuming all 7 digit phone numbers are equally likely, what is the probability that all of the digits in a random phone number are different?
Added by Veronica P.
Step 1
Each digit in the phone number can be any digit from 0 to 9, giving us 10 choices per digit. Therefore, the total number of possible 7-digit phone numbers is calculated as follows: \[ 10^7 = 10,000,000 \] Show more…
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