A bag contains five white and four red balls. Two balls are picked at random from the bag. What is the probability that they both are different color?
Q1. A bag contains five white and four red balls. Two balls are picked at random from the bag. What is the probability that they both are different color?
Answer: 05-Sep
Explanation: P(one white, one red) = C(5,1)×C(4,1)/C(9,2) = 20/36 = 5/9. Show the calculation clearly when solving similar quantitative items.