Five books, one each in Physics, Chemistry, Mathematics, English and Hindi are to be arranged on a shelf. In how many ways can this be done?

Four books, one each in Chemistry, Physics, Biology and Mathematics, are to be arranged in a shelf. In how many ways can this be done ?

In how many ways can a tissue grow in size?

Eight children are to be seated on a bench. In how many ways can the children be seated ?

From a class of 32 students, 4 are to be chosen for a competition. In how many ways can this be done ?

A committee of 2 boys is to be selected from 4 boys. In how many ways can this be done ?

There are 4 candidates for the post of a lecturer in Mathematics and one is to be selected by votes of 5 men. In how many ways can the votes be given ?

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

Six X 's have to be placed in the squares of the figure below, such that each row contains atleast one X. in how many different ways can this be done?

A tea party is arranged for 16 persons along two sides of a long table with 8 chairs on each side. Four persons wish to sit on one particular and two on the other side. In how many ways can they be seated?

In an Examination, a candidate has to pass in each of the four subjects. In how many ways can he fail ?