there are 2 sides to a coin so 2 outcomes so far
then 3 balls to chose from so 3 times as many
so
h=heads
t=tails
r=red
b=blue
g=green
I will put them into slots where column 1 is coins and column 2 is color of ball
1, 2
h, r
h, b
h, g
t, r
t, b
t, g
there are 6 possible outcomes
another way is to multiply all the choices together so 2 coin choices and 3 ball choices so 2 times 3=6