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Revision history of "2012 OIM Problems/Problem 4"

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  • (cur | prev) 14:46, 14 December 2023‎ Tomasdiaz (talk | contribs)‎ . . (415 bytes) (+415)‎ . . (Created page with "== Problem == Let <math>a, b, c, d</math> be positive integers such that <math>a - b + c - d</math> is odd and divides <math>a^2 - b^2 + c^2 - d^2</math>. Show that <math>a -...")
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