The number of ways of dividing 20 persons into 10 couples is

The number of ways of dividing 100 scoutes into 3 squads of 50,30,20, respectively is

The number of ways of dividing 100 scouts into 3 squads of 50, 30, 20 respectively is

The number of ways of dividing 10 books into 3 group of 5,3,2, books respectively is

Find the number of ways of dividing 6 couples in 3 groups if each group has exactly one couple and each group has 2 males and 2 females.

Find the number of ways of dividing 6 couples in 3 groups if each group has exactly one couple and each group has 2 males and 2 females.

Find the number of ways of dividing 20 objects in three groups of sizes 8, 7 and 5.

The number of ways of dividing 15 men and 15 women into 15 couples each consisting a man and a woman is