JEE Main 2010 Mathematics question
There are two urns. Urn A has 3 distinct red balls and urn B has 9 distinct blue balls. From each urn two balls are taken out at random and then transferred to the other. The number of ways in which this can be done is
Answer: (3)
Solution
Choose 2 of the 3 red balls and 2 of the 9 blue balls: , option (3).