'not randomly generated' what does the even mean?!?

As expressed in this question:
The telephone numbers for a region of a state have an area code of 570. The next seven digits represent the local telephone numbers for that region. A local telephone number cannot begin with a 0 or 1. Your cousin lives within the given area code.
What is the probability of not randomly generating your cousin’s telephone number? Explain.

I understand the denominators - one 8 and 10 to the sixth power - but not the numerators. I don't understand why the chance of randomly generating a number and the chance of NOT randomly generating a number are the same thing... (are they the same thing???)

Thanks in advance!


Less is more. Stay pure. Stay poor.
This will be likely an incorrect answer, but if you had a 7-digit telephone number, that would mean you have 0000000-9999999 as options. So 10M possibilities. Selecting the target number by chance would have a 1/10M chance and not selecting it would be 9999999/10M.