A large cube 10cm on a side is composed of smaller cubes 1 cm on a
side. The large cube is printed red on its outside surfaces and then all the cubes are mixed in a drum. If one cube is selected randomly, which of the following is the approximate probability that the cube will have at least one red face?
# of small cubes painted on one side=surface area of large cube/are of one side of small cube=6*10*10=600/1=600
total small cubes=10*10*10=1000
P(cube will have at least one red face)=600/1000=3/5