3000000 phone numbers are possible in Wilmington if they must be divisible by 2 or 5.
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There are 10 digits from 0 to 9.
We have to make a number starting at 910, we only need to fill 7 more digits.
So, total no of ways = 10⁷
= 10000000
If a number is divisible by 2 or 5, then its unit digit is 2, 0 or 5.
So, we have 3 options for unit digits.
Now, 10 options for the rest of 6 digit
So, the number of ways = 10⁶ × 3
= 3000000
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