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Number 10 thank you! 9. How many nine-digit Social Security numbers are possible? 10. An apartment building purchases a new lock system for its 175

Number 10 thank you!

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9. How many nine-digit Social Security numbers are possible? 10. An apartment building purchases a new lock system for its 175 units. A lock is opened by punching in a two-digit code. Has the apartment management made a wise purchase

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