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  4. Number of whole numbers between 1 and 1000 do not contain the digit 1, is

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Q. Number of whole numbers between 1 and 1000 do not contain the digit 1, is

Permutations and Combinations

Solution:

Each digit in the number can be $0, 2, 3, 4, ......., 9$, for a total of $9^3 = 729.$
However, we cannot have the number $000$, so we subtract one to get $728$