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PROBLEMSMichael Woltermann, Christopher Hilliar, Stephen J. Herschkorn, Oleh Faynshteyn, H. A. ShahAli, Michael W. Botsko, Ovidiu Furdui, José H. Nieto, Allen Schwenk, Dorin Marghidanu, Robert L. Doucette, Northwestern University Math Problem Solving Group, Michael W. Botsko, Eugene A. Herman, Jody M. Lockhart, William P. Wardlaw, Jim Delany, Ovidiu Furdui and Nicholas C. Singer · Mathematics Magazine · 2009