How many four-digit numbers are there in the range 1000-9999, where a digit may be repeated any number of times? 410 104 9 x 10^3 3 x 43
Added by Lorraine C.
Step 1
For the first digit, it can be any number from 1 to 9 (since it cannot be 0). So, there are 9 choices for the first digit. For the second, third, and fourth digits, they can be any number from 0 to 9. So, there are 10 choices for each of these digits. Show more…
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