A blindfolded person draws one ball from an urn containing 20 balls numbered from 1 to20. Assuming that all the balls have the same probability of being drawn, what is the probability that a ball marked with a perfect square will be drawn?
A、1/5
B、 1/10
C、3/20
D、1/4
E、2/5
发布时间：2025-03-17 06:44:11
