MathDB

a) In each box of a

7\times 7

board one of the numbers is written:

1, 2, 3, 4, 5, 6

7

of so that each number is written in seven different boxes. Is it possible that in no row and no column are consecutive numbers written?
b) In each box of a

5\times 5

board one of the numbers is written:

1, 2, 3, 4

5

of so that each one is written in five different boxes. Is it possible that in no row and in no column are consecutive numbers written?

Problem Statement