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There are 10 digits in a billion.
Usually has 10 digits.
The ones column are in single digits and if there are none then the 0 digit is used.
they have 10
10
-10
In which country?
501
four
10
10 digits: 1,000,000,000 is one billion dollars.
8 if the hour is always 2 digits. (01:10) 57 if you go with single digit hours under 10:00 (1:01) Maybe