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How many nine-digit social security numbers are possible

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Reference no: EM131636284

Question: 1. How many nine-digit Social Security numbers are possible? 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?

2. A palindrome is a string of characters that reads the same forward and backward. How many five-letter English language palindromes are possible?

Reference no: EM131636284

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