SAT Math Practice Question #28873 - SATify | SATify
#28873
combinatorics
counting
arrays
hard
120 sec
How many 5×5 arrays whose entries are 0s and 1s are there such that the row sums (the sum of the entries in each row) are 1,2,3,4,5, in some order, and the column sums (the sum of the entries in each column) are also 1,2,3,4,5, in some order?