Question

1) 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? A) 504 B) 512 C) 10000 D) 9990

Answer 1

Answer:

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