1
Part of 2003 IberoAmerican
Problems(2)
18th ibmo - argentina 2003/q1
Source: Spanish Communities
4/8/2006
There are two sequences of numbers, with consecutive integers each, and a table of rows and columns
Is it always possible to arrange the numbers in the first sequence in the first row and the second sequence in the second row, such that the sequence obtained of the column-wise sums form a new sequence of consecutive integers?
What if is replaced with ?
algebra unsolvedalgebra
18th ibmo - argentina 2003/q4
Source: Spanish Communities
4/9/2006
Let be the set of the first positive integers. Determine the maximum integer such that the set has a subset of elements such that there is no consecutive integers in such subset. For this value of , find the number of subsets of with elements with the given property.
combinatorics unsolvedcombinatorics