MathDB
18th ibmo - argentina 2003/q4

Source: Spanish Communities

April 9, 2006
combinatorics unsolvedcombinatorics

Problem Statement

Let M={1,2,,49}M=\{1,2,\dots,49\} be the set of the first 4949 positive integers. Determine the maximum integer kk such that the set MM has a subset of kk elements such that there is no 66 consecutive integers in such subset. For this value of kk, find the number of subsets of MM with kk elements with the given property.