Mathematics
Mathematics, 23.08.2019 20:20, queentynaisa

Alock 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. , , , how many combinations are possible?
504
512
1
9990

answer
Answers: 2
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Alock on a fence door has a 4 digit combination. each digit can be any number
between 0 – 9. t...

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