Circles X and Y are concentric. If the radius of circle X is two times that of circle Y, what is the probability that a point selected inside circle X at random will be outside circle Y? Select the correct option:
A) 13
B) Pi/3
C) Pi/2
D) 5/6
E) 3/4
Small circle radius = a, so area = PI a ^ 2   Large circle radius = 2a, so area =4. PI a ^ 2   Area of shaded region = 4PI a^2 - PI a^2 = 3 PI a^2   So, probability = ( 3 PI a^2 ) / (4 PI a^2 )   = 3/4 = Answer = 3/4
<result>E</result>
Circles X and Y are concentric. If the radius of circle X is two times that of circle Y, what is the probability that a point selected inside circle X at random will be outside circle Y?