中等MATH-PROB-008
A bag has 3 red and 2 blue balls. Two balls are drawn at random without replacement. What is the probability that both are red?
A. 9/25
B. 3/5
C. 3/10✓ 答案
D. 1/10
解說
P = (3/5) × (2/4) = 3/10. The value 9/25 is (3/5)^2, which is the answer with replacement. The value 3/5 is only the first draw.