How many 3-digit positive integers can be written in decimal notation that do not have 0 in their decimal expansion? Give as answer the sum of such 3-digit numbers
Added by Myon M.
Step 1
For the first digit, we have 9 choices (1-9), because a 3-digit number cannot start with 0. For the second digit, we also have 9 choices (1-9), because we are not allowing 0. For the third digit, we again have 9 choices (1-9), because we are not allowing 0. Show more…
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