A lock on a fence door has a 4 digit combination. Each digit can be any number between 0 – 9. The only restriction is that all 4 characters cannot be the same (e.g. 1111, 2222, 3333, etc.). How many combinations are possible? 504 512 10000 9990
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Since each digit in the 4-digit combination can be any number from 0 to 9, there are 10 possible choices for each digit. Show more…
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