MathDB

27

Part of 2018 India PRMO

Problems(1)

let's do some combinatorics

Source:

8/19/2018
What is the number of ways in which one can color the squares of a 4×44\times 4 chessboard with colors red and blue such that each row as well as each column has exactly two red squares and two blue squares?
combinatoricsPRMO