SOLUTION: a comapny wants an 8 digit phone number, how many combinations can it have if the first number isn't 0

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Question 301644: a comapny wants an 8 digit phone number, how many combinations can it have if the first number isn't 0
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
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Each number can vary from 0 to 9 (10 total) except the first number which can vary from 1 to 9(9 total).
N=%289%2A10%2A10%2A10%29%2A%2810%2A10%2A10%2A10%29=90,000,000 total combinations