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What are the steps to answer this problem? A personal identification number (PIN) that opens a certain lock consists of a sequence of 3 different

What are the steps to answer this problem?

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A personal identification number (PIN) that opens a certain lock consists of a sequence of 3 different digits from 0 through 9, inclusive. How many possible PINs are there? 9. (A) 120 (B) 360 (C) 720 (D) 729 (E) 1,000

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