The dartboard below has a radius of 6 inches. Each of the concentric circles has a radius two inches less than the next larger circle. If nine darts land randomly on the target, how many darts would we expect to land in a non-shaded region?

[asy]import graph;
fill(Circle((0,0),15),gray(0.7));
fill(Circle((0,0),10),white);
draw(Circle((0,0),20));
draw(Circle((0,0),15));
draw(Circle((0,0),10));
[/asy]
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
The dartboard below has a radius of 6 inches. Each of the concentric circles has a radius two inches less than the next larger circle. If nine darts land randomly on the target, how many darts would we expect to land in a non-shaded region?

[asy]import graph;
fill(Circle((0,0),15),gray(0.7));
fill(Circle((0,0),10),white);
draw(Circle((0,0),20));
draw(Circle((0,0),15));
draw(Circle((0,0),10));
[/asy]
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
6
The dartboard below has a radius of 6 inches. Each of the concentric circles has a radius two inches less than the next larger circle. If nine darts land randomly on the target, how many darts would we expect to land in a non-shaded region?

[asy]import graph;
fill(Circle((0,0),15),gray(0.7));
fill(Circle((0,0),10),white);
draw(Circle((0,0),20));
draw(Circle((0,0),15));
draw(Circle((0,0),10));
[/asy]
train