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All/Any different? (Posted on 2005-08-16) |
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Given positive integer n, consider the set of numbers {n²+1, n²+2, ... (n+1)²}. If we pick two numbers x and y out of that set, how many different values can the product xy take?
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Submitted by Federico Kereki
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Rating: 3.5000 (6 votes)
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Solution:
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(Hide)
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n(2n+1) -- see http://www.qbyte.org/puzzles/p110s.html |
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