Media type: E-Article Title: 3500 Contributor: Gibson, Emma M.; Leith, J. D. imprint: Mathematical Association of America, 1933 Published in: The American Mathematical Monthly, 40 (1933) 7, Seite 428-429 Language: English ISSN: 0002-9890; 1930-0972 Keywords: Problems and Solutions Origination: Footnote: Access State: Open Access