+0  
 
-1
41
1
avatar+42 

Find the number of ways of arranging the numbers 1,2,3...12 in a 3x4 array (with three rows and four columns), so that the sum of the numbers in each column is divisible by 3. Each number must appear exactly once in the array.

 Jan 30, 2020
 #1
avatar
0

The probability works out to 8/1197.

 Jan 30, 2020

49 Online Users