Five concentric circles with radii 1, 2, 3, 4, and 5 are drawn, one inside the other, dividing the circle of radius 5 into five regions: a circle of radius and 4 annuli (rings). What is the probability that a point chosen randomly from within the circle of radius 5 lies in the annulus whose inner radius is 3 and whose outer radius is 4? Can someone tell me if this is the right answer? i got a 7/25 chance. THanks!