Y by
The cheering team of Ubon Ratchathani University sits on the amphitheater that has
seats arranged into a
grid. Every seat is occupied by exactly one person, and each person has a blue sign and a yellow sign.
Count the number of ways for each person to raise one sign so that each row and column has an odd number of people raising a blue sign.


Count the number of ways for each person to raise one sign so that each row and column has an odd number of people raising a blue sign.