Mathematical Gems III (Dolciani Mathematical Expositions, No.9)
Publisher: Mathematical Assn of Amer
Published: July 1985
Language: eng
Format: Paperback
Number of pages: 260
ISBN-13: 9780883853139
Subjects: Mathematics; Science/Mathematics; Combinatorial Analysis; Theory Of Numbers
First sentence: No matter which 55 positive integers may be selected from (1, 2,..., 100), prove that you must choose some two that differ by 9, some two that differ by 10, some two that differ by 12, and some two that differ by 13, but that you need not have any two that differ by 11.