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ERIC Number: EJ853819
Record Type: Journal
Publication Date: 2009
Pages: 3
Abstractor: ERIC
Reference Count: 0
ISSN: ISSN-0045-0685
E-Mail Order
Scott, Paul
Australian Mathematics Teacher, v65 n1 p3-5 2009
A secretary has "n" letters and "n" addressed envelopes. Instead of matching each letter with the corresponding envelope, she inserts the letters in a random manner. What are the chances that every letter will be in the wrong envelope? In this article, the author presents a solution to this problem and discusses possible ways of placing the letters.
Australian Association of Mathematics Teachers (AAMT). GPO Box 1729, Adelaide 5001, South Australia. Tel: +61-8-8363-0288; Fax: +61-8-8362-9288; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A