Question 23
A $\bigtriangleup$ or $\bigcirc$ is placed in each of the nine squares in a $3 \times 3$ grid. Shown below is a sample configuration with three $\bigtriangleup$’s in a line.
How many configurations will have three $\bigtriangleup$’s in a line and three $\bigcirc$’s in a line?
How many configurations will have three $\bigtriangleup$’s in a line and three $\bigcirc$’s in a line?