MathDB
2021 Spring LMT Division B Problem 5

Source:

January 22, 2022
combinatorics

Problem Statement

Find the number of ways there are to permute the elements of the set {1,2,3,4,5,6,7,8,9}\{1,2,3,4,5,6,7,8,9\} such that no two adjacent numbers are both even or both odd.
Proposed by Ephram Chun
Back to ProblemsView on AoPS