The counting principle works like this.
Multiply the number of choices you have for each character.
If you can have 0000000000 then you would multiply 10x10x10x10x10x10x10x10x10x10 or 10,000,000,000.
10 billion.
If you eliminate that number that there is one less.
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How many times does the digit 1 occur in ten place in the numbers from 1 to 1000?
81
That would be the numbers in the form "32x" (where "x" can be any digit). In other words, ten numbers.
ten
Technically, that is not possible. A digit is another word for a number and it would be impossible for a single number to contain ten numbers.