how make a grid with 4 background colors different if column values is anything? Urgent

1st sorry, because my english isn't good.
my problem is: i have a grid and i need change this background color if the value of three cells is true, if the three cells in distinct collumns is true the color of background is red, if two of three cells is true other color is used,... please i need help. tnks 4 all help