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?  Pick one
A) 5/8  B) 5/9  C) 5/2  D) 5/1  E) 5/7
Two balls can be picked from nine balls in ⁹C₂ ways.   We select one white ball and one red ball from five white balls and four red balls. This can be done ⁵C₁ . ⁴C₁ ways.   The required probability = (5 * 4)/⁹C₂   = 20/36   = 5/9   Answer: 5/9
<result>B</result>
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?