A 'digit' is a numeral - and we have ten of them — 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9. After that we re-use them - 10 is not a digit, it is two digits put together.
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90. all the numbers from 10 through 99
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There are 6484 digits BETWEEN the two given numbers.
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