In how many ways can one put 2 distinguishable objects on a 4x4 board?
In how many ways can one put them so that when you rotate the board to 90 degrees the positions of objects is preserved?
In how many ways can one put 2 distinguishable objects on a 4x4 board?
In how many ways can one put them so that when you rotate the board to 90 degrees the positions of objects is preserved?