There are 36 persons in a society of workers, In how many ways can they choose a president and a secretary?

In how many ways can a tissue grow in size?

In how many ways can five children stand in a queue ?

In how many ways can 8 students be seated in : a line ?

A committee of 11 members sits at a round table. In how many ways can they be seated if the 'President' and the 'Secretary' choose to sit together?

A mathematical club consists of 18 members. In how many Wars can the members select a president, a vice president, a secretary and a treasurer if a member can hold only one position at a time.

In how many ways can 12 things be equally divided among 4 persons ?

A man has 6 friends. In how many ways can he invite one or more of his friends to a party ?

In how many ways can 12 things be equally divided : into 2 heaps ?

A man has 10 friends. In how many ways he can invite one or more of them to a party?

A man has 7 friends. In how many ways can he invite one or more of them to a party ?